Sviatoslav II Iaroslavich or Sviatoslav II Yaroslavich (; Russian and Ukrainian: Святослав Ярославич; 1027 – 27 December 1076) was Grand Prince of Kiev between 1073 and 1076. He was born as a younger son of Grand Prince Yaroslav the Wise. His baptismal name was Nicholas. He ruled the Principality of Vladimir in Volhynia in his father's lifetime (from around 1040 to 1054). Yaroslav the Wise, who divided the Kievan Rus' among his five sons in his testament, willed the Principality of Chernigov to Sviatoslav. Sviatoslav joined his brothers, Iziaslav of Kiev and Vsevolod of Pereyaslav, in forming a princely "triumvirate" that oversaw the affairs of Kievan Rus' until 1072. The three brothers together fought against their enemies, including the nomadic Oghuz Turks, and their distant relative, Prince Vseslav of Polotsk. The Cumans defeated their united force in the autumn of 1068, but Sviatoslav routed a Cuman band plundering his principality. The "triumvirate" broke up, when Sviatoslav, supported by his younger brother Vsevolod, dethroned and replaced their older brother Iziaslav in 1073. He commissioned the compilation of at least two miscellanies of theological works. Otherwise, his short reign was uneventful. Early life Sviatoslav was the fourth son of Yaroslav the Wise, Grand Prince of Kiev, and his wife, Ingegerd of Sweden. He was born in 1027. The Lyubetskiy sinodika list of the princes of Chernigov which was completed in the Monastery of Saint Anthony in Lyubechwrites that his baptismal name was Nicholas. The Russian Primary Chronicle writes that Sviatoslav was staying "at Vladimir" (Volodymyr-Volynskyi, Ukraine) in Volhynia around the time his father fell seriously ill before his death. According to the historian Martin Dimnik, the chronicle's report shows that Yaroslav the Wise had, most probably in about 1040, appointed Sviatoslav to rule this important town of the Kievan Rus'. On his deathbed, Yaroslav the Wise divided the most important towns of his realm among his five sonsIziaslav, Sviatoslav, Vsevolod, Igor, and Vyacheslavwho survived him. To Sviatoslav, he bequeathed Chernigov (Chernihiv, Ukraine). The dying grand prince also ordered that his four younger sons should "heed" their eldest brother, Iziaslav, who received Kiev. Triumvirate Yaroslav the Wise died on 20 February 1054. His three elder sonsIziaslav of Kiev, Sviatoslav of Chernigov, and Vsevolod of Pereyaslavdecided to jointly govern the Kievan Rus'. Historian Martin Dimnik writes that taking into account Sviatoslav's political and military skills it "is reasonable to assume that he was one