"The intervention in the Kievan succession crisis of 1015\u20131019 by the Polish ruler Boles\u0142aw Chrobry 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 Boles\u0142aw, ruler of Poland, intervened on Sviatopolk's behalf. The intervention was initially successful as Boles\u0142aw defeated Yaroslav's armies, and temporarily secured the throne for Sviatopolk. But when Boles\u0142aw 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."@en . . . . "unknown but estimated as similar to opposing size"@en . "Kievan Rus in the 11th century, with adjoining regions"@en . . . . "Military aid of Polish ruler Boles\u0142aw I the Brave to his son-in-law, Sviatopolk I the Accurse"@en . "Kievan Rus'"@en . . . "Kievan succession crisis, 1015\u20131019"@en . . "unknown"@en . "Kievan Rus' loyal to Yaroslav the Wise"@en . "1018"^^ . "uncertain: Germans , Hungarians and Pechenegs , 2,000\u20135,000 Polish soldiers"@en . . . "Kievan Rus' loyal to Sviatopolk allied with the Duchy of Poland and Kingdom of Hungary"@en . "Temporary victory for Sviatopolk and Boles\u0142aw"@en . . "The intervention in the Kievan succession crisis of 1015\u20131019 by the Polish ruler Boles\u0142aw Chrobry 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 Boles\u0142aw, ruler of Poland, intervened on Sviatopolk's behalf."@en . . . . "Boleslaw I's intervention in the Kievan succession crisis, 1018"@en . "Boles\u0142aw I's expedition to Kiev"@en . . . . . . . . .