Khanate of Kazan
In the first half of the 15th century, as the result of Golden Horde's collapse, the Khanate of Kazan emerged as the dominant power in the Volga–Kama region. As Muscovy grew in power and struggled for control of trade routes and territory with the Golden Horde's successor states, Kazan was at times dominated by factions favorable to Moscow, and at other times by factions advocating alliance with other Tatar polities such as the Crimean Khanate. Finally, the khanate was conquered by Ivan the Terrible in 1552.
Read more about this topic: History Of Tatarstan