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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 according to the Assyrian sources), proto-Turkic aboriginal nation who inhabited Azerbaijan since XX BC, practiced Tengrism and mainly used the Turkic Runic script which dated back to the Cuneiform script of Sumeria. The Turkic runic alphabet has 29 letters. 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 the 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 the 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 or the Arranian alphabet. The script contains 54 characters.