Chaldia, Theme of

Chaldia (Greek: Khaldia) is a historical region located in mountainous interior of the eastern Black Sea, northeast Anatolia (modern Turkey).

Its name is derived from a people called the Chaldoi (or Chalybes) that inhabited the region in Antiquity.

Chaldia is used throughout the Byzantine period and is established as a formal theme, known as the Theme of Chaldia, by 840.

During the late Middle Ages, it forms the core of the Empire of Trebizond until its fall to the Ottomans 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 Sun God.

Bryer notes at the time of his writing that a number of villages in the Of district were still known as "Halt"

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