Sviatopolk I of Kiev

Sviatopolk I Vladimirovich, called the Accursed (c. 979–1019), was made prince of Turov in 988 by Vladimir the Great, whose son or stepson he was, and married a daughter of Bolesław I of Poland. Encouraged by his wife and Bishop Reinbern, he prepared to fight Vladimir, who imprisoned them; Reinbern died in captivity.

After Vladimir died in 1015 he seized Kiev; chronicles accuse him of murdering his brothers Boris and Gleb, later venerated as saints. Yaroslav of Novgorod defeated him at Lyubech in 1016, but Sviatopolk returned in 1018 with Polish and Pecheneg help and retook Kiev, only to quarrel with Bolesław. In 1019 Yaroslav routed him on the Alta River, and Sviatopolk died fleeing west.