The Odrysian kingdom (; Ancient Greek: Βασίλειον Ὀδρυσῶν), also known as Odrysia, was an ancient Thracians state that thrived between the early 5th century BCE and the early 3rd / late 1st century BC. Located in present-day Bulgaria, southeastern Romania (Northern Dobruja), northern Greece and Eastern Thrace, it was a tribal amalgam dominated by the Odrysians that was the first large political entity to develop in the eastern Balkans.
The Odrysian kingdom was founded by king Teres I, exploiting the collapse of the Persian presence in Europe due to failed invasion of Greece in 480–79.
Afterwards the kingdom disintegrated: southern and central Thrace were divided among three Odrysian kings, while the northeast came under the dominion of the kingdom of the Getae. The three Odrysian kingdoms were eventually conquered by the rising kingdom of Macedon under Philip II in 340 BC. A much smaller Odrysian state was revived in around 330 BC by Seuthes III, who founded a new capital named Seuthopolis that functioned until the second quarter of the 3rd century BC. After that there is little conclusive evidence for the persistence of an Odrysian state, with the exception of a dubious Odrysian king fighting in the Third Macedonian War named Cotys. The Odrysian kingdom was attacked by the Roman Republic in the late 1st century BC, when the Odrysian heartlands eventually became known as the Sapaean kingdom, a client state of the Roman Republic, which was finally abolished and converted into a Thracia in 45-46 AD.
Thracians had already settled in the 2nd millennium BCE, and were featured in the epics of Homer. Occasional references to them appear in the following centuries, although it was not until the 5th century when Greek literature developed an interest in discussing non-Greeks more extensively. In the 7th and 6th centuries, much of the Thracian coast was settled by Ancient Greeks colonists who founded numerous towns, like Thasos, Byzantion or Odessus. The political history of the Thracian tribes of this age is virtually unknown, although it is recorded that in the late 6th century, Athenian settlers interacted with a "king of Thrace" (and possible predecessor of the Odrysian kings?) residing north of the Gallipoli peninsula. The absence of imported artefacts confirms that inland Thrace north of the Rhodopes remained largely isolated from the Aegean trade until the late 6th century.
It seems most likely that the Achaemenids did not establish a satrapy (provincial administration) in Thrace, even though the historian Herodotus claimed that the subdued regions had to pay taxes. As a matter of fact, there is no evidence for important administrative centers. Instead, Persian authority was merely exercised through a couple of garrisoned forts, most importantly those of Doriskos and Eion. Hence, the vast majority of Thrace remained unaffected by the Persian presence. After the failed invasion of Greece in 480-79, the Persian foothold in Europe collapsed. By around 450, Persian authority in Europe, including Thrace, had vanished entirely.
Teres most likely came to dominate central Thrace soon after 480 BC. Building his realm on a privileged warrior aristocracy, he and his son Sitalces expanded the realm from the Danube in the north to the outskirts of Abdera at the Aegean Sea. He also expanded to eastern Thrace, although he suffered a setback at the hands of the Thynoi. In the north-east, he cemented the position of his realm by allying himself with the kingdom of Scythia under king Ariapeithes, who married Teres' daughter. In conclusion, the Odrysians were the first to supersede the Thracian tribal system and establish a large state in the eastern Balkans.
Around the middle of the 5th century, when Sitalces had not yet succeeded his father, the Odrysians intervened in a Scythian civil war, seemingly on the side of the dethroned king Scylas against Octamasadas, who was a son of Ariapeithes and Teres' sister. When the two armies met at the Danube, however, Sitalces simply agreed to hand over Scylas (who was killed on the spot) for an unnamed brother of his who resided among the Scythians. Another important event may have happened further east, in the Bosporan Kingdom, when a Thracian named Spartokos I seized power in around 438. It is not unlikely that he was of Odrysian descent and that his takeover was instigated by the Odrysian royal house, although this must remain speculation.
In the south, much of coastal Thrace had passed under the rule of Classical Athens, making them direct neighbours of the Odrysians. The Athenians had already taken some interest in the Thracian interior before 431, but it was in said year when they concluded an alliance with Sitalces against Perdiccas II of Macedon in the west. This pact was cemented by a dynastic marriage, as Sitalces would marry the sister of the Athenian ambassador, Nymphodoros of Abdera. Sitalces' son Sadokos was sent to Athens and was granted the Athenian citizenship. Sitalces, apparently an experienced leader with political acumen, would prove his commitment to the alliance in the next year, when he arrested a Peloponnesian embassy that tried to persuade him to join the Spartan side and handed it over to Athens.
At the turn of the year 428, Sitalces raised a massive, multi-ethnic army to march against Macedon and insurgents on the Chalkidiki. His army consisted of a variety of Thracians (some, like those of the Rhodopes, were independent, but joined nonetheless), Getae and some Paeonians. While Sitalces managed to subjugate some of the Thracian tribes of the lower Strymon, his invasion of eastern Macedon and the Chalkidiki was less successful, as his opponents avoided open combat and simply hid behind their walls. The Odrysian army had not the means to storm them, plus winter was approaching and food supplies were running out. Furthermore, the Athenian force that was promised to them never arrived, perhaps because Athens feared the might of the unleashed Thracian kingdom. After failed negotiations with Perdiccas II, Sitalces retreated back home. Thus, after only 30 days the Odrysian invasion had come to an end.
Initially raised at the court of Amadocus, Seuthes was sent to eastern Thrace several years before 405. By 405 he had managed to consolidate his position over a realm stretching from Apollonia Pontica over the Strandzha to parts of the northern Propontis coast. In 400 BC he hired Greek mercenaries under Xenophon to expand his dominion at the cost of Teres and other rebels, forcing them to reacknowledge the authority of Amadocus. Due to lacking funds they left his service already after two months. Seuthes II eventually rose against Amadocus, although little is known about this insurrection. In 389 the Athenian general Thrasybulus mediated between the two parties, resulting in Seuthes II, whom Xenophon called "ruler of the coast region", recognizing Amadocus' authority again.
Amadocus, who had defied Seuthes' insurrection probably due to his own popularity, died soon after 389. His successor was Hebryzelmis, about whom very little is known, but who, like Amadocus, sought the good will of Athens. Seuthes II on the other hand allied with Sparta. An Athenian inscription from the year 386/5 confirms that Hebryzelmis sent a delegation to Athens to legitimize his rule and/or gain an ally against Seuthes. However, the Athenians had little interest in another war in the region and thus limited themselves to kind words. Meanwhile, Seuthes had risen yet again against the crown. This second war went badly, as he seemingly lost all of his domains before reconquering them thanks to a mercenary army led by Iphicrates. Iphicrates subsequently married the daughter of Seuthes' son, Cotys I.
Cotys eventually set his eyes on the strategic Chersonese and the Hellespont, challenging the Athenian hegemony in the region. The Athenians were more than ready to fight for the control of the Hellespont, as it was vital for Athens' grain supply from the northern Black Sea region. An early invasion in 367 failed, but in 363/2 Cotys was more successful and repeatedly defeated several Athenian generals. Thus, the Chersonese and the Hellespont had come under direct Odrysian rule. This achievement, however, proved short-lived: much to Athens relief, Cotys I was eventually murdered in 360/59.
Cersebleptes was the most ambitious of the three. He continued his father's war against Athens for the Chersonese, while also striving to reunite the Odrysian kingdom. His attempts proved futile, for Amadocus II and Berisades, who received support from Athens, resisted his attacks. In 357 he was forced to accept a peace treaty that sealed the division of the Odrysian state. An inscription from Athens describes said treaty. First, Cersebleptes had to cease his hostilities in the Cheresonese. Second, all three kings and Athens agreed to share their tributes received from the Greek colonies along the Aegean and the Hellespont. Third, the kings promised to enter an alliance with Athens and both sides had to provide each other with military support if tributary Greek colonies revolted. Cersebleptes, however, soon quit that treaty and continued his war in the Chersonese.
Cersebleptes continued his attempts to unite the Odrysian kingdoms: in 353/4 he and Philip discussed the invasion of the kingdom of Amadocus II and the Athenian domains in Thrace, while around a year later he marched against the kingdom of Cetriporis. Meanwhile, Athens feared a possible alliance between Philip and Cersebleptes and decided to make an example by conquering the town of Sestos and eradicating its population. Intimidated, Cersebleptes renounced his claims on much of the Chersonese and allied with Athens. This was unacceptable for Philip, who allied with Amadocus II and marched against Cersebleptes. After besieging him in his residence in Heraion Teichos in 351, he forced the Thracian king to surrender and took his son as a hostage. Around this time, Philip also abolished Cetriporis' kingdom and deposed Amadocus II in favour of Teres II.
After these events, the Thracian front remained peaceful until 347 or early 346, when the Athenians again attempted to strengthen their presence in Thrace, which they probably did at the request of Cersebleptes. Macedon expelled the Athenian garrisons and defeated the Odrysians, preventing yet again a Thraco-Athenian alliance against him. As a result of this campaign Philip also put the Aeagean coast as far east as Acontisma (not the banks of the Nestos river as often assumed) under direct Macedonian administration.
A few years later Cersebleptes allied with Teres II and invaded the Chersonese, which was now under Macedon's protection. After asking the Persian king Artaxerxes III to cut the support of the Ionian towns for Cersebleptes, Philip finally felt confident enough to begin his most ambitious project so far: the conquest of inland Thrace in the form of a large campaign that would last from 342 to 340. Few details are known about this campaign. It seems to have started in May or June, when Philip's army penetrated the interior by marching upstream the Martisa river. The Odrysians resisted valiantly and confronted the Macedonians in many battles. Philip faced several setbacks and even seems to have lost at least one battle. By the spring of 341, fighting was still raging and Philip was forced to call in reinforcements. Although detailed evidence is lacking he finally managed to improve his situation and defeated Cersebleptes and Teres at some point between the second half of 341 and the first half of 340.
By the middle of the 4th century, there existed a Getic kingdom that was to thrive for a century. The Getic capital was Helis, which has been identified with the archaeological site of Sboryanovo, which was founded in the 330s or early 320s and housed around 10.000 inhabitants. It seems that the Getae also became active in Muntenia north of the Danube, a region that would come to constitute a part of the "Dacia" of imperial Roman historiography. The first Getic king to appear in the sources was Cothelas, who married his daughter Meda to Philip II, thus concluding an alliance between the two states. This probably happened during or shortly after Philip's conquest of the Odrysians. The kingdom survived two wars with Lysimachus and the Celtic invasion in around 280, but eventually disintegrated a few decades later. Helis/Sboryanovo was completely destroyed by an earthquake in the middle of the 3rd century.
After Alexander's death in 323, one of his bodyguards named Lysimachus was appointed as the satrap of Thrace. Soon after his arrival he faced off with Seuthes, who had rallied much of Thrace around his banner. Seuthes' goal seems to have been the revival of an independent Odrysian state. A battle ensued between him and Lysimachus, which Lysimachus barely and by no means decisively won. Both sides prepared for a second conflict, but the primary source for this event, Diodorus Siculus, provides no details on its outcome.
In any case, both parties eventually reached a settlement, restricting Seuthes to the interior and Lysimachus to the coastal regions of the Aegean and Black Sea. There is no evidence for Lysimachus vassalizing Seuthes. Thrace north of the Rhodopes probably remained outside of Lysimachus' reach, as he may have regarded its pacification not worth the money and manpower. In 313 Seuthes allied with revolting Greek towns on the western shore of the Black Sea, but Lysimachus defeated this alliance. It is possible that to guarantee the peace between the two opponents, Seuthes married a daughter of Lysimachus named Berenice. Afterwards, there is no evidence for another confrontation between the two.
Seuthes was keen to establish a Hellenistic kingdom, although he avoided to label himself as king on his coins. Probably after the death of Alexander in 323, Seuthes founded a town at the Tonzos river, near modern Kazanlak. He named it after himself: Seuthopolis. The town was primarily based on contemporary Macedonian foundations and showed heavy Greek influences. Seuthopolis probably acted as the capital of Seuthes' kingdom. The size and power of this kingdom should not be overestimated, as its influence was most likely limited to the hinterland of Seuthopolis, in particular the valley between the Rhodopes in the south to the Haemus in the north and the Stryama in the west to the upper Tonzos in the east. Thus, his realm only covered the northwestern fringes of the former Odrysian empire. Seuthes also only issued bronze coins, which were insufficient to challenge the Macedonian economic hegemony and its royal mintings in more precious metals.
A long inscription from Seuthopolis attests to the decline of the fortunes of the town and the trouble in Seuthes' household. It mentions the wife of Seuthes, Berenice, and their four (probably underage) sons Hebryzelmis, Teres, Satocos and Satalas. The document was issued in the name of Berenice and includes the phrase "when Seuthes was in good health", which implies that by the time of writing, he was either dead or dying and that Berenice had taken the rule. The inscription describes negotiations between Berenice and Spartokos, the ruler of Cabyle, a town once founded by Philip II. Indeed, Cabyle had not remained a Macedonian fort for long, but began to mint coins and developed into a city-state with considerable influence. Spartokos is known from several coins minted after 281 where he is addressed as king ( basileus).
Although not mentioned in the Seuthopolis inscription and known only from a few coins and an inscription in a grave from Kazanlak, Seuthes seemed to have another son named Roigos, who eventually became king. The fate of Seuthes' dynasty remains enigmatic. Other Thracian monarchs recorded in sources from the 3rd century, like Cotys or Scostocus, can not be proved to have been Odrysian, even if they are often labelled as such by modern authors.
The end of Seuthopolis is a matter of debate, but it is clear that the town was destroyed still in the first half of the 3rd century. According to some scholars it was conquered by the Celts in the 270s. The Celts were ravaging much of the Balkan Peninsula since the early 270s and also led numerous incursions into Thrace. In 278 and led by Comontorius, they eventually founded a kingdom in eastern Thrace centered around Tylis. A newer theory proposes the destruction of the town in the 250s, based on a revamped dating of pottery, numismatic evidence and the presence of several Celtic artefacts. The archaeological evidence also shows the employment of siege artillery, which is unlikely to have been utilized by Celts. It may therefore be that Seuthopolis was not destroyed by the Celts, but by the Seleucids king Antiochus II, who campaigned in the Thracian interior in around 252.
In the last years of the 3rd century, Macedonia under king Philip V began a renewed expansion to the east, exploiting the weakness of the Ptolemies after the death of Ptolemy IV. While Philip's initial focus was on coastal Thrace, he also led a campaign into the interior. Temporarily losing his Thracian holdings after the end of the Second Macedonian War in 197, he reconquered most of them a decade later, while again campaigning in the Thracian interior. In 184 or 183 he pushed into the plains of the upper Hebros, defeated the Odrysians and other local tribes and conquered Philipopolis, although the Odrysians reconquered the town soon afterwards. It may be noteworthy that no Odrysian king is mentioned. While in 181, Philip was still climbing the Haemus in northern Thrace, his Thracian empire collapsed with his death two years later.
Between 171 and 168, Philip's heir Perseus engaged the Roman Republic in the Third Macedonian War. Perseus' most trusted ally in this war was the Thracian king Cotys, whom the historian Polybius calls an Odrysian. He fought in the battles of Callinicus and Pydna, but eventually became a Roman ally after the war. Perhaps he is identical with the Cotys mentioned by the historian Strabo. However, his Odrysian background has been doubted, as the account of Polybius, the only remaining source (minus Livy, who relied on Polybius), called him an Odrysian only once, while also calling the Getic king Dromichaetes an Odrysian. It may thus be likely that Polybius used "Odrysian" as a synonym for "Thracian". Furthermore, after the war Cotys was described as being active in the hinterland of Abdera at the Aegean coast, implying that he was rather a Sapaeans king, who are known to have resided in the Rhodopes. His identity must remain uncertain. It is a fact, however, that Cotys was the last king in the sources to be explicitly labelled an "Odrysian". There is also no evidence that Odrysians had any affiliations with the royal houses of the Sapaeans and Asti of the 1st century BC.
By the middle of the 1st century BC, the Romans dominated coastal Thrace, while the most important Thracian tribes were the Sapaeans and the Asti. The Romans decided not to implement an administration in the Thracian interior, but instead relied on indirect influence via a large, Hellenized client kingdom resembling the Odrysian kingdom of old. Probably soon after the Battle of Actium in 31 BC, the Romans abolished the Asti dynasty and established the Sapaeans in Bizye, the capital of the former. The Sapaeans of Bizye created a Sapaean kingdom loyal to Rome and even expanded into the interior. Little is known about how the Sapaeans administered this region, although they made Philippopolis a royal residence. In 21 AD king Rhoemetalces II took refuge in Philippopolis when he was confronted with a rebellion, among them Odrysians. While the historian Tacitus described them as powerful, their uprising failed due to their bad coordination. The Romans eventually dissolved the Sapaean kingdom in 45/6 and turned it into the Thracia.
Due to the fragmentary nature of the remaining sources, the royal court and the administration of the kingdom must remain largely obscure. It can be assumed that, as in early Macedon, the Odrysian kings formed the heart of the realm and controlled the policy and the minting of coins, appointed loyal deputies and commanded the troops on the battlefield. The realm was essentially the king's estate. Below the king was an elite of horse warriors and administrators deriving not only from the royal court, but also from rival tribes. Thucydides called said local rulers paradynasteuontes, meaning "those who share power". A similar elite class loyal only to the king, the hetairoi, could also be found in Macedon. The Odrysian kingdom appears to have been rather decentralized, consisting of many different regional elites vying for power. Their rule over their subjects, who lived in scattered hamlets, was very loose and exercised mainly through raiding and demanding tribute.
There is no evidence that the early Odrysian kings had a fixed capital. Instead, they probably maintained a mobile court, moving throughout the kingdom and residing in fortified residences. These small fortified places, which the Greeks called , were the backbones of the Thracian aristocracy in a society that did not build towns or cities. This changed somewhat in the late 4th century, when Seuthes III founded Seuthopolis, marking the establishment of early state-like institutions which were probably inspired by those of Hellenistic Macedon. Seuthopolis' size always remained quite small, housing not more than 1.000 inhabitants. It is very likely that it was the home of the kingdom's aristocracy, while the common population continued to live outside the city walls, still practicing the agro-pastoral subsistence economy of old.
Initially, the Odrysian army was divided into light infantry and light cavalry. The infantry used bows, slings, spears, swords, axes and light crescent-shaped shields called pelte, giving these warriors their name: "peltasts". Round and oval shields were, however, also utilized. A weapon primarily found in the western and central Rhodoes was the Rhomphaia. Except of slings, the cavalry used the same weapons as the infantry. In the later 5th century the Thracian cavalry began to adopt armour. The employed helmets were of the Chalcidian, Phrygian helmet and Corinthian types, of which the Chalcidian type seems to have been the most popular. The earliest torso armour was a type of primitive muscle cuirass of cylindrical form that had long fallen out of use elsewhere. Leather and linen armour was also worn. In the 4th century scale armour became popular, while were also adopted at that time. Finally, there is also evidence that the Thracians employed siege artillery, in particular .
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