The Khazars () were a semi-Nomadic empire Turkic people who established a major commercial empire in the late 6th century CE spanning modern European Russia, southern Ukraine, and western Kazakhstan. It was the most powerful polity to emerge from the break-up of the Western Turkic Khaganate. Astride a major artery of commerce between Eastern Europe and Western Asia, Khazaria became one of the foremost trading empires of the early medieval world, commanding the western marches of the Silk Road and playing a key commercial role as a crossroad between China, the Middle East, and Kievan Rus'. For some three centuries (–965), the Khazars dominated the vast area extending from the Volga-Don steppes to the eastern Crimea and the northern Caucasus.
For most of its history, Khazaria served as a buffer state between the Byzantine Empire, the nomads of the northern steppes, and the Umayyad and Abbasid Caliphates, having previously been Byzantium's Proxy war against the rival Sasanian Empire. Around 900, the Byzantines began encouraging the Alans to attack Khazaria; this move aimed to weaken Khazar control over Crimea and the Caucasus and facilitate imperial diplomacy and Proselytism towards the powerful Kievan Rus' in the north. By 969, Sviatoslav I of Kiev, the ruler of Kievan Rus', along with his allies, conquered the Khazar capital of Atil, ushering the decline and disintegration of Khazaria by the mid 11th century.
Although they were likely a confederation of different Turkic languages peoples, the precise origins and nature of the Khazars are uncertain, since there is no surviving record in the Khazar language and the state was polyglot and polyethnicity. Their native religion is thought to have been Tengrism, like that of the North Caucasian Huns and other Turkic peoples, although their multiethnic population seems to have included Paganism, Judaism, Christians, and Muslims. Although there is evidence that the ruling elite of the Khazars had converted to Rabbinic Judaism in the 8th century, the scope of the conversion to Judaism within the khanate remains uncertain.
The Khazars are variably believed to have contributed to the ethnogenesis of numerous peoples, including the Hazaras, Hungarians, Kazakhs, the Don Cossacks and Zaporozhian Cossacks, Kumyks, Krymchaks, Crimean Karaites, Csangos, Mountain Jews, and Subbotniks. The late 19th century saw the emergence of a theory that the core of today's Ashkenazi Jews are descended from a hypothetical Khazarian Jewish diaspora that migrated westward into modern France and Germany. Linguistic and genetic studies have not supported the theory, and despite occasional support, most scholars view it with considerable scepticism. The theory is sometimes associated with antisemitism.
In Oghuz languages Turkic languages, the Caspian Sea is still named the "Khazar Sea", reflecting the enduring legacy of the medieval Khazar state.
D. M. Dunlop tried to link the Chinese term for "Khazars" to one of the tribal names of the Uyğur, or Toquz Oghuz, namely the Qasar (Chinese language 葛薩 Gésà). The objections are that Uyğur 葛薩 Gésà/ Qasar was not a tribal name but rather the surname of the chief of the 思结 Sijie tribe (Sogdian language: Sikari) of the Toquz Oğuz (Ch. 九姓 jĭu xìng), and that in Middle Chinese the ethnonym "Khazars" was always prefaced with Tūjué, then still reserved for Göktürks and their splinter groups, ( Tūjué Kěsà bù:突厥可薩部; Tūjué Hésà:突厥曷薩) and "Khazar's" first syllable is transcribed with different characters (可 and 曷) than 葛, which is used to render the syllable Qa- in the Uyğur word Qasar. While it is far from given that the Khazars are not signifying a multi-ethnic and multi-lingual cluster of peoples and clans, some more nomadic, some less, it doesn't exclude that some clans, or splintergroups, or even rulers has identified with the name(s) of the Khazars, in the variety of ways it has been expressed.
After their conversion it is reported that they adopted the Hebrew script, and it is likely that, although speaking a Turkic language, the Khazar chancellery under Judaism probably corresponded in Hebrew language.
The latter based upon the assertion of the Persian historian Estakhri the Khazar language was different from any other known tongue. Alano-As was also widely spoken. Eastern Common Turkic, the language of the royal house and its core tribes, in all likelihood remained the language of the ruling elite in the same way that Mongol continued to be used by the rulers of the Golden Horde, alongside of the Kipchaks speech spoken by the bulk of the Turkic tribesmen that constituted the military force of this part of the Činggisid empire. Similarity, Oğuric, like Qipčaq Turkic in the Jočid realm, functioned as one of the languages of government. One method for tracing their origins consists in the analysis of the possible etymologies behind the ethnonym "Khazar".
The ruling family of this confederation may have hailed from the Ashina tribe of the Western Turkic Khaganate, although Constantine Zuckerman regards Ashina and their pivotal role in the formation of the Khazars with scepticism. Golden notes that Chinese and Arabic reports are almost identical, making the connection a strong one, and conjectures that their leader may have been Irbis Seguy, who lost power or was killed around 651. Moving west, the confederation reached the land of the Akatziroi, who had been important allies of Byzantium in fighting off Attila's army.
By the first decades of the 7th century, the Ashina yabgu Tong managed to stabilise the Western division, but upon his death, after providing crucial military assistance to Byzantium in routing the Sasanian army in the Persian heartland, the Western Turkic Qağanate dissolved under pressure from the encroaching Tang dynasty armies and split into two competing federations, each consisting of five tribes, collectively known as the "Ten Arrows" ( On Oq). Both briefly challenged Tang hegemony in eastern Turkestan. To the West, two new nomadic states arose in the meantime, Old Great Bulgaria under Kubrat, the Duōlù clan leader, and the Nǔshībì subconfederation, also consisting of five tribes. The Duōlù challenged the Avars in the Kuban River-Sea of Azov area while the Khazar Qağanate consolidated further westwards, led apparently by an Ashina dynasty. With a resounding victory over the tribes in 657, engineered by General Su Dingfang, Chinese overlordship was imposed to their East after a final mop-up operation in 659, but the two confederations of Bulğars and Khazars fought for supremacy on the western steppeland, and with the ascendency of the latter, the former either succumbed to Khazar rule or, as under Asparukh, Kubrat's son, shifted even further west across the Danube to lay the foundations of the First Bulgarian Empire in the Balkans ().
The Qağanate of the Khazars thus took shape out of the ruins of this nomadic empire as it broke up under pressure from the Tang dynasty armies to the east sometime between 630 and 650. After their conquest of the lower Volga region to the East and an area westwards between the Danube and the Dniepr, and their subjugation of the Onogurs-Bulgars union, sometime around 670, a properly constituted Khazar Qağanate emerges, becoming the westernmost successor state of the formidable Göktürk Qağanate after its disintegration. According to Omeljan Pritsak, the language of the Onoğur-Bulğar federation was to become the lingua franca of Khazaria as it developed into what Lev Gumilev called a "steppe Atlantis" ( stepnaja Atlantida/ Степная Атлантида). Historians have often referred to this period of Khazar domination as the Pax Khazarica since the state became an international trading hub permitting Western Eurasian merchants safe transit across it to pursue their business without interference. The high status soon to be accorded this empire to the north is attested by Ibn Balkhi's Fârsnâma (c. 1100), which relates that the Sasanian Empire Shah, Khosrau I, placed three thrones by his own, one for the King of China, a second for the King of Byzantium, and a third for the king of the Khazars. Although anachronistic in retrodating the Khazars to this period, the legend, in placing the Khazar qağan on a throne with equal status to kings of the other two superpowers, bears witness to the reputation won by the Khazars from early times.
Settlements were governed by administrative officials known as . In some cases, such as the Byzantine settlements in southern Crimea, a tudun would be appointed for a town nominally within another polity's sphere of influence. Other officials in the Khazar government included dignitaries referred to by ibn Fadlan as Jawyshyghr and Kündür, but their responsibilities are unknown.
The Khazar slave trade constituted one of the two great furnishers of slaves to the Muslim market to slavery in the Abbasid Caliphate (the other being the Iranian Sâmânid amîrs), supplying it with captured Slavs and tribesmen from the Eurasian northlands. It profited from the latter which enabled it to maintain a standing army of Khwarezm Muslim troops. The capital Atil reflected the division: Kharazān on the western bank where the king and his Khazar elite, with a retinue of some 4,000 attendants, dwelt, and Itil proper to the East, inhabited by Jews, Christians, Muslims and slaves and by craftsmen and foreign merchants.
The Khazar Khaghanate played a key role in the trade between Europe and the Muslim world in the early middle ages. People taken captive during the viking raids in Europe, such as Ireland, could be transported to Hedeby or Brännö in Scandinavia and from there via the Volga trade route to Russia, where slaves and furs were sold to Muslim merchants in exchange for Arab silver dirham and silk, which have been found in Birka, Wolin and Dublin; during the 8th- and 9th-century this trade route between Europe and the Abbasid Caliphate passed via the Khazar Kaghanate, until it was supplanted in the 10th-century by the route of Volga Bulgaria, Khwarazm, and the Samanid slave trade.
The ruling elite wintered in the city and spent from spring to late autumn in their fields. A large irrigated greenbelt, drawing on channels from the Volga river, lay outside the capital, where meadows and vineyards extended for some 20 farsakhs (c. 60 miles). While customs duties were imposed on traders, and tribute and tithes were exacted from 25 to 30 tribes, with a levy of one sable skin, squirrel pelt, sword, dirham per hearth or ploughshare, or hides, wax, honey and livestock, depending on the zone. Trade disputes were handled by a commercial tribunal in Atil consisting of seven judges, two for each of the monotheistic inhabitants (Jews, Muslims, Christians) and one for the pagans.
Once the Khazars emerged as a power, the Byzantines also began to form alliances with them, dynastic and military. In 695, the last Heraclian emperor, Justinian II, nicknamed "the slit-nosed" (ὁ ῥινότμητος) after he was mutilated and deposed, was exiled to Cherson in the Crimea, where a Khazar governor ( tudun) presided. He escaped into Khazar territory in 704 or 705 and was given asylum by qağan Busir (Ἰβουζῆρος Γλιαβάνος), who gave him his sister in marriage, perhaps in response to an offer by Justinian, who may have thought a dynastic marriage would seal by kinship a powerful tribal support for his attempts to regain the throne. The Khazarian spouse thereupon changed her name to Theodora. Busir was offered a bribe by the Byzantine usurper, Tiberius III, to kill Justinian. Warned by Theodora, Justinian escaped, murdering two Khazar officials in the process. He fled to Bulgaria, whose Khan Tervel helped him regain the throne. Upon his reinstalment, and despite Busir's treachery during his exile, he sent for Theodora; Busir complied, and she was crowned as Augusta, suggesting that both prized the alliance.
Decades later, Leo III (ruled 717–741) made a similar alliance to co-ordinate strategy against a common enemy, the Muslim Arabs. He sent an embassy to the Khazar qağan Bihar and married his son, the future Constantine V (ruled 741–775), to Bihar's daughter, a princess referred to as Tzitzak, in 732. On converting to Christianity, she took the name Irene. Constantine and Irene had a son, the future Leo IV (775–780), who thereafter bore the sobriquet, "the Khazar". Leo died in mysterious circumstances after his Athenian wife bore him a son, Constantine VI, who on his majority co-ruled with his mother, the dowager. He proved unpopular, and his death ended the dynastic link of the Khazars to the Byzantine throne. By the 8th century, Khazars Pax Khazarica (650–c. 950), and even extended their influence into the Byzantine peninsula of Cherson until it was wrested back in the 10th century. Khazar and Fergana mercenaries constituted part of the imperial Byzantine Hetaireia bodyguard after its formation in 840, a position that could openly be purchased by a payment of seven pounds of gold.
Due to the outbreak of the First Fitna and other priorities, the Arabs refrained from repeating an attack on the Khazars until the early 8th century. The Khazars launched a few raids into Transcaucasian principalities under Muslim dominion, including a large-scale raid in 683–685 during the Second Fitna that rendered much booty and many prisoners. There is evidence from the account of al-Tabari that the Khazars formed a united front with the remnants of the Göktürks in Transoxiana.
The Second Arab-Khazar War began with a series of raids across the Caucasus in the early 8th century. The Umayyads tightened their grip on Armenia in 705 after suppressing a large-scale rebellion. In 713 or 714, the Umayyad general Maslamah conquered Derbent and drove deeper into Khazar territory. The Khazars launched raids in response into Albania and Iranian Azerbaijan but were driven back by the Arabs under Hasan ibn al-Nu'man. The conflict escalated in 722 with an invasion by 30,000 Khazars into Armenia inflicting a crushing defeat. Caliph Yazid II responded, sending 25,000 Arab troops north, swiftly driving the Khazars back across the Caucasus, recovering Derbent, and advancing on Balanjar. The Arabs broke through the Khazar defence and stormed the city; most of its inhabitants were killed or enslaved, but a few of them managed to flee north. Despite their success, the Arabs had not yet defeated the Khazar army, and they retreated south of the Caucasus.
In 724, the Arab general al-Jarrah ibn Abdallah al-Hakami inflicted a crushing defeat on the Khazars in a long battle between the rivers Cyrus and Araxes, then moved on to capture Tiflis, bringing Caucasian Iberia under Muslim suzerainty. The Khazars struck back in 726, led by a prince named Barjik, launching a major invasion of Albania and Azerbaijan; by 729, the Arabs had lost control of northeastern Transcaucasia and were thrust again into the defensive. In 730, Barjik invaded Iranian Azerbaijan and defeated Arab forces at Ardabil, killing the general al-Djarrah al-Hakami and briefly occupying the town. Barjik was defeated and killed the next year at Mosul, where he directed Khazar forces from a throne mounted with al-Djarrah's severed head . In 737, Marwan Ibn Muhammad entered Khazar territory under the guise of seeking a truce. He then launched a surprise attack in which The Qaghan fled north and the Khazars surrendered. The Arabs did not have enough resources to influence the affairs of Transcaucasia. The Qağan was forced to accept terms involving his conversion to Islam, and subject himself to the rule of the Caliphate, but the accommodation was short-lived because a combination of internal instability among the Umayyads and Byzantine support undid the agreement within three years, and the Khazars re-asserted their independence. The suggestion that the Khazars adopted Judaism as early as 740 is based on the idea that, in part, it was, a re-assertion of their independence from the rule of both regional powers, Byzantium and the Caliphate, while it also conformed to a general Eurasian trend to embrace a World religions.
Whatever the impact of Marwan's campaigns was, warfare between the Khazars and the Arabs ceased for more than two decades after 737. Arab raids continued to occur until 741, but their control of the region was limited because maintaining a large garrison at Derbent further depleted their already overstretched army. A Third Fitna soon broke out, leading to the Abbasid Revolution and the fall of the Umayyad dynasty in 750.
In 758, the Abbasid Caliph al-Mansur attempted to strengthen diplomatic ties with the Khazars, ordering Yazid ibn Usayd al-Sulami, one of his nobles and the military governor of Armenia, to take a royal Khazar bride. Yazid married a daughter of Khazar Khagan Baghatur, but she died inexplicably, possibly during childbirth. Her attendants returned home, convinced that some members of another Arab faction had poisoned her, and her father was enraged. The Khazar general Ras Tarkhan invaded regions which were located south of the Caucasus in 762–764, devastating Albania, Armenia, and Iberia, and capturing Tiflis. Thereafter, relations between the Khazars and the Abbasids became increasingly cordial, because the foreign policies of the Abbasids were generally less expansionist than the foreign policies of the Umayyads, relations between the Khazars and the Abbasids were ultimately broken by a series of raids which occurred in 799, the raids occurred after another marriage alliance failed.
After the Khazars assumed control of Transcaucasia, at some time they set up towns including Samiran, Samsakly, Sambalut, Samakha, and Samkalak - with the common fragment "Sam" meaning "top" or "high" or "main".
Alliances often shifted. Byzantium, threatened by Varangian Rus' raiders, would assist Khazaria, and Khazaria at times allowed the northerners to pass through their territory in exchange for a portion of the booty. From the beginning of the 10th century, the Khazars found themselves fighting on multiple fronts as nomadic incursions were exacerbated by uprisings by former clients and invasions from former allies. The pax Khazarica was caught in a pincer movement between steppe Pechenegs and the strengthening of an emergent Rus' power to the north, both undermining Khazaria's tributary empire. According to the Schechter Text, the Khazar ruler King Benjamin (ca.880–890) fought a battle against the allied forces of five lands whose moves were perhaps encouraged by Byzantium. Although Benjamin was victorious, his son Aaron II faced another invasion, this time led by the Alans, whose leader had converted to Christianity and entered into an alliance with Byzantium, which, under Leo VI the Wise, encouraged them to fight against the Khazars.
By the 880s, Khazar control of the Middle Dnieper from Kiev, where they collected tribute from Eastern Slavic tribes, began to wane as Oleg of Novgorod wrested control of the city from the Varangian warlords Askold and Dir, and embarked on what was to prove to be the foundation of a Rus' empire. The Khazars had initially allowed the Rus' to use the trade route along the Volga River, and raid southwards. See Caspian expeditions of the Rus'. According to Al Masudi, the qağan is said to have given his assent on the condition that the Rus' give him half of the booty. In 913, however, two years after Byzantium concluded a peace treaty with the Rus' in 911, a Varangians foray, with Khazar connivance, through Arab lands led to a request to the Khazar throne by the Khwârazmian Islamic guard for permission to retaliate against the large Rus' contingent on its return. The purpose was to revenge the violence the Rus' Looting had inflicted on their fellow Muslim believers. The Rus' force was thoroughly routed and massacred. The Khazar rulers closed the passage down the Volga to the Rus', sparking a war. In the early 960s, Khazar ruler Joseph wrote to Hasdai ibn Shaprut about the deterioration of Khazar relations with the Rus': "I protect the mouth of the river (Itil-Volga) and prevent the Rus arriving in their ships from setting off by sea against the Arabs and (equally) all (their) enemies from setting off by land to Derbent."
The Rus' warlords launched several wars against the Khazar Qağanate, and raided down to the Caspian sea. The Schechter Letter relates the story of a campaign against Khazaria by HLGW (recently identified as Oleg of Chernigov) around 941 in which Oleg was defeated by the Khazar general Pesakh. The Khazar alliance with the Byzantine empire began to collapse in the early 10th century. Byzantine and Khazar forces may have clashed in the Crimea, and by the 940s emperor Constantine VII Porphyrogenitus was speculating in De Administrando Imperio about ways in which the Khazars could be isolated and attacked. The Byzantines during the same period began to attempt alliances with the Pechenegs and the Rus', with varying degrees of success. A further factor undermining the Khazar Qağanate was a shift in Islamic routes at this time, as Muslims in Khwarazmia forged trade links with the recently converted Volga Bulgarian Muslims, a move which may have caused a drastic drop, perhaps up to 80%, in the revenue base of Khazaria, and consequently, a crisis in its ability to pay for its defence.
Sviatoslav I finally succeeded in destroying Khazar imperial power in the 960s, in a circular sweep that overwhelmed Khazar fortresses like Sarkel and Tmutarakan, and reached as far as the Caucasian Kassogians/Circassians and then back to Kiev. Sarkel fell in 965, with the capital city of Atil following, c. 968 or 969.
In the Russian chronicle, the vanquishing of the Khazar traditions is associated with Vladimir's conversion in 986. According to the Primary Chronicle, in 986, Khazar Jews were present at Vladimir's disputation to decide on the prospective religion of the Kievan Rus'. Whether these were Jews who had settled in Kiev or emissaries from some Jewish Khazar remnant state is unclear. Conversion to one of the faiths of the people of Scripture was a precondition to any peace treaty with the Arabs, whose Bulgar envoys had arrived in Kiev after 985.
A visitor to Atil wrote soon after the sacking of the city that its vineyards and garden had been razed, that not a grape or raisin remained in the land, and not even alms for the poor were available. An attempt to rebuild may have been undertaken, since Ibn Hawqal and al-Muqaddasi refer to it after that date, but by Al-Biruni's time (1048) it was in ruins.
By the end of the 12th century, Petachiah of Ratisbon reported travelling through what he called "Khazaria", and had little to remark on other than describing its minim (sectaries) living amidst desolation in perpetual mourning. The reference seems to be to Karaites. The Franciscan missionary William of Rubruck likewise found only impoverished pastures in the lower Volga area where Ital once lay. Giovanni da Pian del Carpine, the papal legate to the court of the Mongol Khan Guyuk at that time, mentioned an otherwise unattested Jewish tribe, the Brutakhi, perhaps in the Volga region. Although connections are made to the Khazars, the link is based merely on a common attribution of Judaism.
The 10th century Zoroastrianism Denkard registered the collapse of Khazar power in attributing its eclipse to the enfeebling effects of "false" religion. The decline was contemporary to that suffered by the Transoxiana Samanids empire to the east, both events paving the way for the rise of the Great Seljuq Empire, whose founding traditions mention Khazar connections. Whatever successor entity survived, it could no longer function as a bulwark against the pressure east and south of nomad expansions. By 1043, Kimek tribe and Kipchaks, thrusting westwards, pressured the Oghuz Turks, who in turn pushed the Pechenegs west towards Byzantium's Balkan provinces.
Khazaria nonetheless left its mark on the rising states and some of their traditions and institutions. Much earlier, Tzitzak, the Khazar wife of Leo III, introduced into the Byzantine court the distinctive kaftan or riding habit of the nomadic Khazars, the tzitzakion (τζιτζάκιον), and this was adopted as a solemn element of imperial dress. The orderly hierarchical system of succession by "scales" ( lestvichnaia sistema:лествичная система) to the Grand Principate of Kiev was arguably modelled on Khazar institutions, via the example of the Rus' Khaganate.
The proto-Hungarian Pontic tribe, while perhaps threatening Khazaria as early as 839 (Sarkel), practiced their institutional model, such as the dual rule of a ceremonial kende-kündü and a gyula administering practical and military administration, as tributaries of the Khazars. A dissident group of Khazars, the Kabar, joined the Hungarians in their migration westwards as they moved into Pannonia. Elements within the Hungarian population can be viewed as perpetuating Khazar traditions as a successor state. Byzantine sources refer to Hungary as Western Tourkia in contrast to Khazaria, Eastern Tourkia. The gyula line produced the kings of medieval Hungary through descent from Árpád, while the Qabars retained their traditions longer, and were known as "black Hungarians" ( fekete magyarság). Some archaeological evidence from Čelarevo suggests the Qabars practised Judaism since warrior graves with Jewish symbols were found there, including menorahs, , , , candlesnuffers, ash collectors, inscriptions in Hebrew, and a six-pointed star identical to the Star of David.
The Khazar state was not the only Jewish state to rise between the fall of the Second Temple (67–70 CE) and the establishment of Israel (1948). A state in Yemen also adopted Judaism in the 4th century, lasting until the rise of Islam.
The Khazar kingdom is said to have stimulated messianic aspirations for a return to Israel as early as Judah Halevi. In the time of the Egyptian vizier Al-Afdal Shahanshah (d. 1121), one Solomon ben Duji, often identified as a Khazarian Jew, attempted to advocate for a messianic effort for the liberation of, and return of all Jews to, Palestine. He wrote to many Jewish communities to enlist support. He eventually moved to Kurdistan where his son David Alroy some decades later assumed the title of Messiah and, raising an army for this purpose, took the fortress of Amadiya north of Mosul. His project was opposed by the rabbinical authorities and he was poisoned in his sleep. One theory maintains that the Star of David, until then a decorative motif or magical emblem, began to assume its national value in late Jewish tradition from its earlier symbolic use by Menachem.
The word Khazar, as an ethnonym, was last used in the 13th century by people in the North Caucasus believed to practice Judaism. The nature of a hypothetical Khazar diaspora, Jewish or otherwise, is disputed. Avraham ibn Daud mentions encountering rabbinical students descended from Khazars as far away as Toledo, Spain in the 1160s. Khazar communities persisted here and there. Many Khazar mercenaries served in the armies of the Islamic Caliphates and other states. Documents from medieval Constantinople attest to a Khazar community mingled with the Jews of the suburb of Galata. Khazar merchants were active in both Constantinople and Alexandria in the 12th century.
Many sources suggest, and a notable number of scholars have argued, that the charismatic Ashina clan played a germinal role in the early Khazar state, although Zuckerman dismisses the widespread notion of their pivotal role as a "phantom". The Ashina were closely associated with the Tengri cult, whose practices involved rites performed to assure a tribe of heaven's protective providence. The qağan was deemed to rule by virtue of qut, "the heavenly mandate/good fortune to rule."
On Khazaria's southern flank, both Islam and Byzantine Christianity were proselytising great powers. Byzantine success in the north was sporadic, although Armenian and Albanian missions from Derbend built churches extensively in maritime Daghestan, then a Khazar district. Buddhism also had exercised an attraction on leaders of both the Eastern (552–742) and Western Qağanates (552–659), the latter being the progenitor of the Khazar state. In 682, according to the Armenian chronicle of Movsês Dasxuranc'i, the king of Caucasian Albania, Varaz Trdat, dispatched a bishop, Israyêl, to convert Caucasian "Huns" who were subject to the Khazars, and managed to convince Alp Ilut'uêr, a son-in-law of the Khazar qağan, and his army, to abandon their shamanising cults and join the Christian fold.
The Arab Georgian martyr St Abo, who converted to Christianity within the Khazar kingdom around 779–80, describes local Khazars as irreligious. Some reports register a Christian majority at Samandar, or Muslim majorities.
Jews from both the Islamic world and Byzantium are known to have migrated to Khazaria during periods of persecution under Heraclius, Justinian II, Leo III, and Romanus Lakapēnos. For Simon Schama, Jewish communities from the Balkans and the Bosphoran Crimea, especially from Panticapaeum, began migrating to the more hospitable climate of pagan Khazaria in the wake of these persecutions, and were joined there by Jews from Armenia. The Cairo Geniza, he argues, make it clear the Judaising reforms sent roots down into the whole of the population. The pattern is one of an elite conversion preceding large-scale adoption of the new religion by the general population, which often resisted the imposition. One important condition for mass conversion was a settled urban state, where churches, synagogues or mosques provided a focus for religion, as opposed to the free nomadic lifestyle of life on the open steppes. A tradition of the Iranian Mountain Jews claims that their ancestors were responsible for the Khazar conversion. A legend traceable to the 16th-century Italian rabbi Judah Moscato attributed it to Yitzhak ha-Sangari.
Both the date of the conversion, and the extent of its influence beyond the elite, often minimised in some scholarship, are a matter of dispute, but at some point between 740 and 920 CE, the Khazar royal family and nobility appear to have converted to Judaism, in part, it is argued, perhaps to deflect competing pressures from Arabs and Byzantines to accept either Islam or Christianity.
The conversion of the Khazars to Judaism is an emotionally charged topic in Israel, and two scholars, Moshe Gil (2011) and Shaul Stampfer, (2013) have challenged the authenticity of the medieval Hebrew documents and argue that the conversion of the Khazar elite to Judaism never happened. Alex M. Feldman is critical of Stampfer and Gil's dismissal of "overwhelming textual and archaeological evidence" of Khazarian Judaism, though agrees it is unlikely that Ashkenazim are descended from Khazarian Jews, he posits "a middle ground which can simultaneously accept Khazarian Judaism and doubt the Khazar-Ashkenazi descent theory advanced in dubious genetic studies."
Christian of Stavelot in his Expositio in Matthaeum Evangelistam (c. 860–870s) refers to Gazari, presumably Khazars, as living in the lands of Gog and Magog, who were circumcised and omnem Judaismum observat—observing all the laws of Judaism. New numismatic evidence of coins dated 837/8 bearing the inscriptions arḍ al-ḫazar (Land of the Khazars), or Mûsâ rasûl Allâh (Moses is the messenger of God, in imitation of the Islamic coin phrase: Muḥammad rasûl Allâh) suggest to many the conversion took place in that decade. Olsson argues that the 837/8 evidence marks only the beginning of a long and difficult official Judaization that concluded some decades later. A 9th-century Jewish traveller, Eldad ha-Dani, is said to have informed Spanish Jews in 883 that there was a Jewish polity in the East, and that fragments of the legendary Ten Lost Tribes, part of the line of Simeon and half-line of Manasseh, dwelt in "the land of the Khazars", receiving tribute from some 25 to 28 kingdoms. Another view holds that by the 10th century, while the royal clan officially claimed Judaism, a non-normative variety of Islamisation took place among the majority of Khazars.
By the 10th century, the letter of King Joseph asserts that, after the royal conversion, "Israel returned ( yashuvu yisra'el) with the people of Qazaria (to Judaism) in complete repentance ( bi-teshuvah shelemah)." Persians Ibn al-Faqih wrote that "all the Khazars are Jews, but they have been Judaized recently". Ibn Fadlân, based on his Caliphal mission (921–922) to the Volga Bulğars, also reported that "the core element of the state, the Khazars, were Judaized", something underwritten by the Karaite Judaism scholar Jacob Qirqisani around 937. The conversion appears to have occurred against a background of frictions arising from both an intensification of Byzantine missionary activity from the Crimea to the Caucasus, and Arab attempts to wrest control over the latter in the 8th century CE, and a revolt, put down, by the Kabar around the mid-9th century is often invoked as in part influenced by their refusal to accept Judaism. Modern scholars generally see the conversion as a slow process through three stages, which accords with Richard Eaton's model of syncretic inclusion, gradual identification and, finally, displacement of the older tradition.
Sometime between 954 and 961, Ḥasdai ibn Shaprūṭ, from al-Andalus (Muslim Spain), wrote a letter of inquiry addressed to the ruler of Khazaria, and received a reply from Joseph of Khazaria. The exchanges of this Khazar Correspondence, together with the Schechter Letter discovered in the Cairo Geniza and the famous plato nizing dialogue by Judah Halevi, Kuzari ("Book (of) The Khazari"), which plausibly drew on such sources, provide us with the only direct evidence of the indigenous traditions concerning the conversion. King Bulan is said to have driven out the sorcerers, and to have received angelic visitations exhorting him to find the true religion, upon which, accompanied by his vizier, he travelled to desert mountains of Warsān on a seashore, where he came across a cave rising from the plain of Tiyul in which Jews used to celebrate the Sabbath. Here he was circumcised. Bulan is then said to have convened a royal debate between exponents of the three Abrahamic religions. He decided to convert when he was convinced of Judaism's superiority. Many scholars situate this c. 740, a date supported by Halevi's own account. The details are both Judaic and Türkic: a Türkic ethnogonic myth speaks of an ancestral cave in which the Ashina were conceived from the mating of their human ancestor and a wolf ancestress. These accounts suggest that there was a rationalising syncretism of native pagan traditions with Jewish law, by melding through the motif of the cave, a site of ancestral ritual and repository of forgotten sacred texts, Türkic myths of origin and Jewish notions of redemption of Israel's fallen people. It is generally agreed they adopted Rabbinical rather than Karaite Judaism.
Ibn Fadlan reports that the settlement of disputes in Khazaria was adjudicated by judges hailing each from his community, be it Christian, Jewish, Muslim, or Pagan. Some evidence suggests that the Khazar king saw himself as a defender of Jews even beyond the kingdom's frontiers, retaliating against Muslim or Christian interests in Khazaria in the wake of Islamic and Byzantine persecutions of Jews abroad. Ibn Fadlan recounts specifically an incident in which the king of Khazaria destroyed the minaret of a mosque in Atil as revenge for the destruction of a synagogue in Dâr al-Bâbûnaj, and allegedly said he would have done worse were it not for a fear that the Muslims might retaliate in turn against Jews. Ḥasdai ibn Shaprūṭ sought information on Khazaria in the hope he might discover "a place on this earth where harassed Israel can rule itself" and wrote that, were it to prove true that Khazaria had such a king, he would not hesitate to forsake his high office and his family in order to emigrate there.
14 ascribed to Saadia Gaon or to the Karaite scholar Benjamin Nahâwandî, interpreted "The Lord hath loved him" as a reference "to the Khazars, who will go and destroy Babylon" (i.e., ), a name used to designate the country of the Arabs. This has been taken as an indication of hopes by Jews that the Khazars might succeed in destroying the Caliphate.
Another Turkic Crimean group, the Krymchaks had retained very simple Jewish traditions, mostly devoid of halakha, and very much taken with magical superstitions which, in the wake of the enduring educational efforts of the great Sephardi scholar Chaim Hezekiah Medini, came to conform with traditional Judaism.
Though the assertion they were not of Jewish stock enabled many Crimean Karaites to survive the Holocaust, which led to the murder of 6,000 Krymchaks, after the war, many of the latter, somewhat indifferent to their Jewish heritage, took a cue from the Crimean Karaites, and denied this connection in order to avoid the antisemitic effects of the stigma attached to Jews.
The German Orientalist Karl Neumann, in the context of an earlier controversy about possible connections between the Khazars and the ancestors of the Slavs, suggested as early as 1847 that emigrant Khazars might have influenced the core population of Eastern European Jews.
The theory was then taken up by Abraham Harkavy in 1869, when he also claimed that a possible link existed between the Khazars and the Ashkenazim, but the theory that Khazar converts formed a major proportion of the Ashkenazim was first proposed to the Western public in a lecture which was delivered by Ernest Renan in 1883. Occasional suggestions that there was a small Khazar component in East European Jews emerged in works by Joseph Jacobs (1886), Anatole Leroy-Beaulieu, a critic of antisemitism (1893),, Israël chez les nations (1893) Maksymilian Ernest Gumplowicz, and by the Russian-Jewish anthropologist Samuel Weissenberg. In 1909, Hugo von Kutschera developed the notion into a book-length study, arguing that the Khazars formed the foundational core of the modern Ashkenazim. Maurice Fishberg introduced the notion to American audiences in 1911. The idea was also taken up by the Polish-Jewish economic historian and General Zionists Yitzhak Schipper in 1918. Israel Bartal has suggested that from the Haskalah onwards, polemical pamphlets against the Khazars were inspired by Sephardi Jews organizations which opposed the Khazaro-Ashkenazim.
Scholarly anthropologists, such as Roland B. Dixon (1923), and writers such as H. G. Wells (1920) used it to argue that "The main part of Jewry never was in Judea", a thesis that was to have a political echo in later opinion.
In 1932, Samuel Krauss ventured the theory that the biblical Ashkenaz referred to northern Asia Minor, and he identified it as the ancestral homeland of the Khazars, a position which was immediately disputed by Jacob Mann. Ten years later, in 1942, Abraham Polak (sometimes referred to as Poliak), later professor for the history of the Middle Ages at Tel Aviv University, published a Hebrew monograph in which he concluded that the East European Jews came from Khazaria. D.M. Dunlop, writing in 1954, thought that very little evidence supported what he considered a mere assumption, and he also argued that the Ashkenazi-Khazar descent theory went far beyond what "our imperfect records" permit. In 1955, Léon Poliakov, who assumed that the Jews of Western Europe resulted from a "panmixia" in the first millennium, asserted that it was widely assumed that Europe's Eastern Jews were descended from a mixture of Khazarian and German Jews. Poliak's work found some support in Salo Wittmayer Baron and Ben-Zion Dinur, but was dismissed by Bernard Weinryb as a fiction (1962). Bernard Lewis was of the opinion that the word in Cairo Geniza interpreted as Khazaria is actually Hakkari and therefore it relates to the Kurds of the Hakkari mountains in southeast Turkey.
The Khazar-Ashkenazi hypothesis came to the attention of a much wider public with the publication of Arthur Koestler's The Thirteenth Tribe in 1976, which was both positively reviewed and dismissed as a fantasy, and a somewhat dangerous one. Israeli historian Zvi Ankori argued that Koestler had allowed his literary imagination to espouse Poliak's thesis, which most historians dismissed as speculative. Israel's ambassador to Britain branded it "an anti-Semitic action financed by the Palestinians", while Bernard Lewis claimed that the idea was not supported by any evidence whatsoever, and it had been abandoned by all serious scholars. Raphael Patai, however, registered some support for the idea that Khazar remnants had played a role in the growth of Eastern European Jewish communities, and several amateur researchers, such as Boris Altschüler (1994), kept the thesis in the public eye. The theory has been occasionally manipulated to deny Jewish nationhood. Recently, a variety of approaches, from linguistics (Paul Wexler) to historiography (Shlomo Sand) and population genetics (Eran Elhaik, a geneticist from the University of Sheffield) have emerged to keep the theory alive. In a broad academic perspective, both the idea that the Khazars converted en masse to Judaism and the suggestion they emigrated to form the core population of Ashkenazi Jewry, remain highly polemical issues. One thesis held that the Khazar Jewish population went into a northern diaspora and had a significant impact on the rise of Ashkenazi Jews. Connected to this thesis is the theory, expounded by Paul Wexler, dissenting from the majority of Yiddish linguists, that the grammar of Yiddish contains a Khazar substrate.
Benjamin Disraeli's early novel Alroy (1833) draws on Menachem ben Solomon's story. The question of mass religious conversion and the indeterminability of the truth of stories about identity and conversion are central themes of Milorad Pavić's best-selling mystery story Dictionary of the Khazars.
H.N. Turteltaub's Justinian, Marek Halter's Book of Abraham and Wind of the Khazars, and Michael Chabon's Gentlemen of the Road allude to or feature elements of Khazar history or create fictional Khazar characters.
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