The Khanate of Sibir (Сыбыр ҡанлыҡ, Себер ханлығы, سبر خانلغی), also known as the Siberian Yurt or Khanate of Turan was a Bashkir and TatarИсхаков Д. М. Тюркско-татарские государства XV—XVI вв. — Казань: Институт истории им. Ш. Марджани АН РТ, 2004.— Глава 2 — C. 32. Khanate located in southwestern Siberia with a Turco-Mongol ruling class. Throughout its history, members of the Shaybanid and Taibugid dynasties often contested the rulership over the Khanate between each other; both of these competing tribes were direct patrilineal descendants of Genghis Khan through his eldest son Jochi and Jochi's fifth son Shayban (Shiban) (died 1266). The area of the Khanate had once formed an integral part of the Mongol Empire, and later came under the control of the White Horde and the Golden Horde of 1242–1502. The Khanate of Sibir had an ethnically diverse population of Turkic Siberian Tatars, Bashkirs, and speakers of various Uralic languages – including the Khanty, Mansi, and Selkup. The Sibir Khanate was the northernmost Muslim state in recorded history. Its defeat by Yermak Timofeyevich in 1582 marked the beginning of the Russian conquest of Siberia. The Sibir Khanate was administered by Mirzas (which is a noble title) who originated from various indigenous Siberian tribes. These Mirzas organized loosely knit dominions, which were all under the nominal authority of the Khan of Tyumen and Sibir. Mirzas also led the warriors of the Khanate of Sibir into battle and owed nominal allegiance to the Khan of Tyumen and Sibir. Islam was the professed religion of the Sibir Khanate; it was the religion of the ruling Khan of Tyumen and Sibir. Grand mosques, palaces and fortified walls were constructed by the ruling class in both Tyumen and Sibir. Islam was professed by not only the Khan but also the Mirzas, who were often educated in famous Islamic centers in Central Asia like Bukhara and Samarkand. However, shamanism and other traditional beliefs were practiced by much of the masses.