Sviatoslav I Igorevich (
Old East Slavic: С~тославъ / Свѧтославъ Игорєвичь,
Sventoslavŭ / Svantoslavŭ Igorevičǐ;
Old Norse:
Sveinald Ingvarsson; ,
Sviatoslav Igorevich; ,
Sviatoslav Ihorovych; ,
Sviataslaŭ Iharavich; ,
Svetoslav, ,
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.