During almost all the its history, Ryazan Principality was in conflict with its provincial Pronsk Principality until the latter was completely annexed to Ryazan in 1483 during the regency of Anna of Ryazan.
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It is plausible that the inclusion of the Pronsk udel into the Principality of Ryazan was possible due to Anna’s mediation between her husband and Ivan III.
Oleg I of Ryazan, nicknamed the Red, ruled the Principality of Ryazan in 1252–1258