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There were 26 ethnicities in Caucasian Albania according to Moses of Kalankatuyk. All of them could be separated into three major linguistic groups: Turkic, Caucasian, Iranian languages.
The Turukkaeans (Turuk, Turk), proto-Turkic aboriginal
nations who inhabited Azerbaijan since XX BC, practiced Tengrism and mainly used the Turkic Runic script which dated back to the Cuneiform script of Sumeria, those ones who adopted the Christianity used both the Runic and the Greek. Eventually due to an oppression from the Armenians, Arabs and Mongols, those Turkic speaking christians migrated to Cappadocia and formed a Karamanli Turkish community, the Karamanlides. The Greek alphabet for writing Turkic is called Karamanlidika (Καραμανλήδικα / Καραμανλήδεια γραφή). Example, Bardanes Tourkos (Βαρδάνης ὁ Τοῦρκος) was a Byzantine general of Turkic origin who launched an unsuccessful rebellion against Emperor Nikephoros I (r. 802–811) in 803. His name shows that he was baptised in the Church of Arran, and of Turkic origin.
The Caucasian speaking lived mainly in the north part of the kingdom and used the alphabet which was based on Syriac and Aramaic. Eventually, it became the alphabet that is often referred as the Alphabet of Caucasian Albania.