Astrakhan Khanate
In campaigns in 1554 and 1556, Russian troops conquered the Astrakhan Khanate at the mouths of the Volga River, and the new Astrakhan fortress was built in 1558 by Ivan Vyrodkov to replace the old Tatar capital. The annexation of the Tatar khanates meant the conquest of vast territories, access to large markets and control of the entire length of the Volga River. Subjugating Muslim khanates turned Muscovy into an empire.