After Svyatoslav's death in 972, his three sons, Yaropolk, Oleg, and Vladimir, fought over control of the territory of Kievan Rus. This period of discord lasted from the late 10th century into the early 11th century.
The feud began when Yaropolk, who had succeeded Svyatoslav as the Grand Prince of Kiev, clashed with his brothers. Oleg, who ruled the Drevlians, was killed in 977 during the conflict. Vladimir, initially a prince of Novgorod, fled to Scandinavia but returned in 980 with Varangian support. He defeated and killed Yaropolk, consolidating power and becoming the Grand Prince of Kiev.
Vladimir's rule (980-1015) marked the end of the feud and the beginning of a more stable and prosperous era for Kievan Rus.