Sviatoslav I of Kyiv

Sviatoslav I Igorevich (Old East Slavic: Ст҃ославъ / Свѧтославъ Игорєвичь, romanized: Svętoslavŭ Igorevičǐ; Russian: Святослав Игоревич; Ukrainian: Святослав Ігорович, romanized: Sviatoslav Ihorovych; Belarusian: Святаслаў Ігаравіч;, also spelled Svyatoslav, was Grand Prince of Kiev 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.