ヴォルガ・ブルガール
Ghabdula Chelbir Mustansir (or only Chelbir; ) was ruler of Volga Bulgaria from 1178 to 1225. He was the son of Otak. During the reign of Chelbir, Volga Bulgaria strengthened its economy and military. Over his reign, the capital moved from Bolghar to Bilär.