Sviatoslav I Igorevich (Old East Slavic: С~тославъ / Свѧтославъ Игорєвичь, Sventoslavŭ / Svantoslavŭ Igorevičǐ; Old Norse: Sveinald Ingvarsson; Russian:Святослав Игоревич, Sviatoslav Igorevich; Ukrainian:Святослав Ігорович, Sviatoslav Ihorovych; Belarusian:Святаслаў Ігаравіч, Sviataslaŭ Iharavich; Bulgarian:Светослав, Svetoslav, Greek:Σφενδοσθλάβος, Sphendosthlabos) (c. 942 – March 972), also spelled Svyatoslav, Grand prince of Kiev. The son of Igor of Kiev and Olga, Sviatoslav is famous for his persistent campaigns in the east and south, which precipitated the collapse of two great powers of Eastern Europe, Khazaria and the First Bulgarian Empire. He also conquered numerous East Slavic tribes, defeated the Alans and attacked the Volga Bulgars, and at times was allied with the Pechenegs and Magyars.