Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Sviatoslav Iaroslavich (1027 December 27, 1076, Kiev) was the Prince (Kniaz) of Chernihiv from 1054 to 1073 and Grand Prince (Veliki Kniaz) of Kiev from 1073 until his death. A son of Iaroslav I the Wise, he was a founder of the Chernihiv princely line and is sometimes referred to as Sviatoslav of Chernihiv. Upon his father''s death in 1054, Sviatoslav joined his brothers Vsevolod and Iziaslav in forming a kind of a princely triumvirate that oversaw the affairs of Kievan Rus'' until 1072. In 1067, they defeated Vseslav of Polotsk, on the Nemiga River and took him prisoner. A year later, the brothers were defeated by the Polovtsi on the Alta River. After a while, Sviatoslav returned to defeat these steppe nomads with a smaller force at the town of Snov, thus enhancing his prestige among the populace.