Казанская губерния
In 1717, Astrakhan Governorate was separated from Kazan Governorate; in 1719—Nizhny Novgorod; in 1744—Orenburg; in 1781—Vyatka, Simbirsk, and Ufa Governorates were separated. Under Catherine the Great (1781–1796) Kazan was the center of a namestnichestvo (viceroyalty), with Kazan, Penza, and Saratov Governorates as its integral parts.