Khanate of Sibir
In the 1570s the entrepreneur Semyon Stroganov and other sons of Anikey Stroganov enlisted many cossacks for protection of the Ural settlements against attacks by the Tatars of the Siberian Khanate, led by Khan Kuchum. Stroganov suggested to their chief Yermak, hired in 1577, to conquer the Khanate of Sibir, promising to help him with supplies of food and arms.