Principality of Ryazan

The Principality of Ryazan, later known as the Grand Principality of Ryazan, was a principality from 1129 to 1521. Its capital was the city of Ryazan, now known as Old Ryazan, which was destroyed in 1237 during the Mongol invasions. The capital was moved to Pereyaslavl-Ryazansky, later renamed Ryazan. Initially a part of the Principality of Murom, it fully split off from the Principality of Chernigov by 1129 as Murom-Ryazan. Murom was taken by Moscow in 1392, while Ryazan later became dependent on Moscow and was formally taken over by Vasili in 1521, and incorporated into the centralized Russian state. It maintained its formal independence longer than any other Russian principality.