Chaldia (, Khaldia) was a historical region located in the mountainous interior of the eastern Black Sea, northeast Anatolia (modern Turkey) in West Asia. Its name was derived from a people called the Chaldoi (or Chalybes) that inhabited the region in . Chaldia was used throughout the Byzantine Empire period and was established as a formal theme, known as the Theme of Chaldia (Greek: θέμα Χαλδίας), by 840. During the Late Middle Ages, it formed the core of the Empire of Trebizond until its fall to the Ottoman Empire in 1461.
Anthony Bryer traces the origin of its name not to Chaldea, as Constantine VII had done, but to the Urartian language, for whose speakers Ḫaldi was the Solar deity. Bryer notes at the time of his writing that a number of villages in the Of district were still known as "Halt".Anthony Bryer, "Greeks and Türkmens: The Pontic Exception", Dumbarton Oaks Papers, 29 (1975), p. 116f Other scholars, however, reject the Urartian connection. Χάλυψ, the tribe's name in Greek language, means "tempered iron, steel", a term that passed into Latin as chalybs, "steel". Sayce derived the Greek name Chalybe from Hittite Khaly-wa, "land of Halys". The Greek Colonisation of the Black Sea Area p. 74 More than an identifiable people or tribe, "Chalybes" was a generic Greek term for "peoples of the Black Sea coast who trade in iron".I. M. Diakonoff The Pre-history of the Armenian People, Yerevan, 1968 (Delmar, New York, 1984) . "The Greeks evidently used the name Chalybes for all of the inhabitants of the Pontus who traded in iron ore (see Pauly, s.v. Chalybes); in some cases we might suspect that the Moschi (in Pontus) and/or the Chalybes were foreign designations for the Chaldians (Halitu, Xaghtik') who actually did live between the Tibareni in the west, the Mosynoeci in the north, and the Matieni in the southeast."
The coastal regions, however, belonged to the Roman province of Pontus Polemoniacus. Only during the reign of the Byzantine emperor Justinian I (r. 527–565) were the warlike tribes, the Sannoi or Zans, subdued, Christianized, and brought under central rule.. Justinian included the entire region in the newly constituted province of Armenia I Magna with Trapezus as its capital (under Emperor Maurice, it was renamed Armenia III).
In the second half of the 7th century, with the establishment of the theme system, the region (Pontus Polemoniacus with the portion of Armenia I known as Keltzene) became part of the Armeniac Theme, initially as the Turma (division) of Chaldia, and later as a semi-distinct duchy ( doukaton) or . By 840, and perhaps as early as 824, it was constituted as a theme in its own right.. Arab geographers of the 9th and 10th centuries report differently on the theme: Ibn Khordadbeh reports that it counted six fortified places, Qudama ibn Ja'far that its troops numbered 4,000, while Ibn al-Faqih writes that its governing strategos commanded 10,000 men (certainly exaggerated) and had two subordinate Turma. According to 10th-century documents, the strategos of Chaldia received twenty pounds of gold as an annual salary, of which half was paid by the state treasury and the rest came from the tax proceeds of his province, including the kommerkion tax on the important trade routes from the East that converged on Trapezus. In the early 10th century, the theme's southern portion, the district of Keltzene, was detached and added to the newly established theme of Mesopotamia.
Until the eastern gains in the latter 10th century, Chaldia remained the northeastern frontier of the Byzantine Empire. During the periods 1091/1095–1098 and 1126–1140, the theme was practically autonomous from the Byzantine government. During the first period, under its doux, Theodore Gabras, the region had been cut off from the remaining Byzantine territories by the Seljuq dynasty, while during the second period, doux Constantine Gabras had rebelled against Emperor John II Komnenos. After the sack of Constantinople in 1204 by Latin crusaders, two Byzantine successor states were established: the Empire of Nicaea, and the Despotate of Epirus. A third, the Empire of Trebizond, was created after Alexios Komnenos, commanding the Georgian expedition in Chaldia a few weeks before the sack of Constantinople, found himself de facto emperor, and established himself in Trabzon.A. A. Vasiliev, "The Foundation of the Empire of Trebizond (1204–1222)", Speculum, 11 (1936), pp. 18f Indeed, by the 14th century, the Empire was reduced practically to the territory of the old theme.. The Empire of Trebizond managed to survive through successive upheavals by a combination of its inaccessible location, a small but capable army, and a sound diplomacy based on marriage alliances, before finally falling to the Ottoman Empire in 1461. Even thereafter, isolated fortresses in the interior continued to resist. Only in 1479 was the region subdued, when the castle of Golacha, the last remaining Christian stronghold in Anatolia, fell. Significant numbers of Pontic Greeks remained in the region throughout the Ottoman period, until the 1923 population exchange between Greece and Turkey.
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