Analysis of information sources in references of the Wikipedia article "زبان جغتایی" in Persian language version.
Chagatai Old Uzbek official.
As a result, we can claim that Şeyhzade Abdürrezak Bahşı was a scribe lived in the palaces of Sultan Mehmed the Conqueror and his son Bayezid-i Veli in the 15th century, wrote letters (bitig) and firmans (yarlığ) sent to Eastern Turks by Mehmed II and Bayezid II in both Uighur and Arabic scripts and in East Turkestan (Chagatai) language.
{{cite book}}: Invalid |display-editors=4 (help)Ebn Mohannā (Jamāl-al-Dīn, fl. early 8th/14th century, probably in Khorasan), for instance, characterized it as the purest of all Turkish languages (Doerfer, 1976, p. 243), and the khans of the Golden Horde (Radloff, 1870; Kurat; Bodrogligeti, 1962) and of the Crimea (Kurat), as well as the Kazan Tatars (Akhmetgaleeva; Yusupov), wrote in Chaghatay much of the time.
As a result, we can claim that Şeyhzade Abdürrezak Bahşı was a scribe lived in the palaces of Sultan Mehmed the Conqueror and his son Bayezid-i Veli in the 15th century, wrote letters (bitig) and firmans (yarlığ) sent to Eastern Turks by Mehmed II and Bayezid II in both Uighur and Arabic scripts and in East Turkestan (Chagatai) language.