legendary founder of a dynasty of Siberian khans; descended from a local noble family having no connection with the clan of Genghis Khan.
After the assassination of the Sheibanid Ibak in 1495, Mahmud, a member of the Taibuga clan, became the ruler of a political alliance of Tatar ulusy (Tatar settlements), called the Siberian Khanate. In the first half of the 16th century, the khans of the Taibuga dynasty established marriage relations with the Kazan khans. In 1555 the khans Ediger and Bekbulat became vassals of Moscow. An end was put to the Taibuga dynasty in 1563, when the Sheibanid Kuchum seized the Siberian throne.