Principality of Ryazan
The Grand Duchy of Ryazan (1078–1521) was a duchy with the capital in Old Ryazan (destroyed by the Mongol Empire in 1237), and then in Pereyaslavl Ryazansky, which later became the modern-day city of Ryazan. It originally split off from the Chernigov Principality as the provincial Murom Principality. Prior to the invasion of Batu Khan. Sometime between 1097 and 1155, the principality became a sovereign state and until 1161, according to the Hypatian Codex, the official name was the Muromo-Ryazan Principality. The first ruler of Ryazan was supposedly Yaroslav Sviatoslavich, Prince of Chernigov (a city  of Kievan Rus'), later Prince of Murom-Ryzan. The capital of the Grand Duchy became Ryazan, however the present-day city of Ryazan is located 40 miles north from the original site of the capital today known as Ryazan Staraya (Old Ryazan). By the end of 12th century, the Principality waged wars with the neighboring Grand Duchy of Vladimir. In the course of that stand-off, the city of Ryazan was burned twice in a span of twenty years from 1186 to 1208. In 1217, there was a culminate point in history of Ryazan when during the civil war inside  the Duchy six leaders of the state were killed by Gleb Vladimirovich who later defected to Cumans. Sometime around that time the Duchy came under a great influence from the Vladimir-Suzdal which was a factor in the fight of Ryazan to resume its sovereignty. In 1217, Gleb Vladimirovich with the support of Cumans tried to take Ryazan back out of the influence of neighboring northern principality of Vladimir, but he was defeated by another Ryazan prince Ingvar Igorevich who in turn became a sole ruler of the state. In December 1237, the Duchy became the first of all other  former states of Kievan Rus' to suffer from the Mongol invasion. The Duchy was completely overrun, with almost the whole princely family killed, the capital destroyed, and later moved to another location. In 1238, some of the armed forces of Ryazan withdrew to unite with the Vladimir-Suzdal army and meet with the forces of Batu Khan near Kolomna. Golden Horde period. In 1301 Prince Daniel of Moscow took Ryazan due to the boyars' betrayal and imprisoned Prince . In 1305 Daniel's son Prince Yury of Moscow ordered his death. The two next successors of Konstantin were killed by the  Golden Horde. In 1380, Prince Oleg Ivanovich did not take part in the Battle of Kulikovo, although he was in ally of Mamai. During almost all its history, the Ryazan Principality was in conflict with its provincial Pronsk Principality until Ryazan completely annexed Pronsk in 1483 during the regency of Anna of Ryazan. Annexation of Ryazan. In 1520, Grand Prince Vasili III of Russia captured and imprisoned in Moscow the last Grand Prince of Ryazan Ivan V 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, in 1521, the Ryazan Principality was merged with Muscovy.