Principality of Chernigov
Later the Ryazan area became part of the Kievan Rus' political system, and came under the domination of the Principality of Chernigov (founded in 988). The Principality of Ryazan operated as a separate entity from 1097 to 1521, when the area became part of the Grand Duchy of Moscow, though with the Qasim Khanate district retaining some autonomy until the 1550s.