Ryazan Principality existed from 1078 when it was separated from the Chernigov Principality. In 1521 the Principality became a part of Muscovy. The first ruler of Ryazan was supposedly Yaroslav Sviatoslavich, Prince of Chernigov (a city of Kievan Rus'), later Prince of Murom-Ryzan. In 1097 the Principality became independent (the Great Principality). In December 1237 Ryazan was ravaged by the Mongols of Batu Khan and the old capital was destroyed. In 1301 Prince Daniel of Moscow took Ryazan due the Boyars' betrayal and confined Prince Konstantin to prison. In 1305 Daniel's son Prince Yury of Moscow was ordered to kill him. The two next successors of Konstantin were killed in the Golden Horde. In 1380 Prince Oleg Ivanovich, though an ally of Mamai, took part in the Battle of Kulikovo. During almost all the its history, Ryazan Principality was in conflict with the Pronsk Principality until the latter was annexed to Ryazan in 1483. In 1520 Grand Prince Vasili III of Russia was captured and imprisoned in Moscow the last Grand Prince of Ryazan because of his relations with the Crimean Khan Mehmed I Giray. In 1521 Prince Ivan Ivanovich fled into the Grand Duchy of Lithuania. After that, the Ryazan Principality was merged with the Muscovy. List of Princes of Ryazan
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