Yaropolk I Sviatoslavich (Old East Slavic: Ꙗрополкъ Свѧтославичъ, transliterated as Iaropolk Svyatoslavich; Russian: Ярополк Святославич; Ukrainian: Ярополк I Святославич; 952 – 11 June 978) was a young and rather enigmatic ruler of Kiev between 972 and 980. He was the oldest son of Svyatoslav. His royal title is traditionally translated as "Prince".
Yaropolk was given Kiev by his father Sviatoslav I, who left on a military campaign against the Danube Bulgars. Soon after Svyatoslav's death, however, civil war began between Yaropolk and his brothers. According to one chronicle, Yaropolk's brother Oleg killed Lyut, the son of Yaropolk's chief adviser and military commander Sveneld. Alternatively, Sveneld is identical to Sviatoslav, as Sveinald/Sveneld is the Norse rendition of the Slavic name. In an act of revenge and at Sveneld's insistence, Yaropolk went to war against his brother and killed him. Yaropolk then sent his men to Novgorod, from which his other brother Vladi