The Khanate of Sibir was a Muslim state located just east of the middle Ural Mountains. Its conquest by Yermak Timofeyevich in 1582 was the first event in the Russian conquest of Siberia.
The republic of Novgorod developed a fur-trading empire across northern Russia as far as the northern Urals and somewhat beyond. East of Novgorod the land was gradually falling under the control of Moscow. Between Moscow and the Urals was the Khanate of Kazan which broke off from the Golden Horde about 1438. In 1478 Moscow captured Novgorod and in 1552, Kazan. This opened up the Perm and Kama River area northeast of Kazan. In 1558 the Stroganovs were given a large fief in the area and began to develop it. There was scattered native resistance. In 1573 the Khan of Sibir sent his nephew to raid the Stroganov lands. Moscow responded with a charter that effectively authorized the Stroganovs to launch a private war against the Khan, but this was not acted on.
The middle Urals at the latitude of Perm are fairly low and easy to cross. The area was inhabited by the Voguls (Mansi) and, north of Tobolsk, the Ostyaks (Khanty people). At some date a group of Siberian Tatars established the Khanate of Sibir and formed a military ruling class over a non-Muslim population. These 'Tatars' were partly Turko-Mongol Muslims from further south and partly local converts to Islam. Two clans contended for power. The Shaybanids were descendents of Genghis Khan. The Taibugids were probably of local origin. In 1563 Kuchum, a Shaybanid, defeated his Taibugid opponent and seized the throne. Before 1571 the Khanate paid limited tribute to Moscow.
The Siberian Chronicles are incomplete and contradictory as are the secondary sources in English. This account follows Lantzeff which seems to be the fullest account in English. Lantzeff follows S. V. Bakhruskin. The main problems are the year the expedition started, details of the route and the location of the battle at Sibir.