s1018

The intervention in the Kievan succession crisis of 1015–1019 by the Polish ruler Bolesław the Brave was an episode in the struggle between Sviatopolk I Vladimirovich ("the Accursed") and his brother Yaroslav ("the Wise") for the rulership of Kiev and Kievan Rus'. It occurred when Sviatopolk's father-in-law Bolesław, ruler of Poland, intervened on Sviatopolk's behalf.
The intervention was initially successful as Bolesław defeated Yaroslav's armies, and temporarily secured the throne for Sviatopolk. But when Bolesław withdrew himself and his army from Kiev, Sviatopolk was unable to retain his position, being defeated by Yaroslav in the following year. Chronicles of the expedition include legendary accounts as well as factual history and have been subject to varied interpretations.

View More On Wikipedia.org