Volodymyr the Great

Volodymyr the Great (c. 958 – 15 July 1015) was Prince of Novgorod, Grand Prince of Kyiv, and ruler of Kyivan Rus' from 980 to 1015. He baptized the Kyiv Rus' in 988 and was proclaimed as Saint Volodymyr by the Orthodox church.
Biography.
Volodymyr was the son of Prince Sviatoslav I of Kyiv of the Rurik dynasty. After the death of his father in 972, Volodymyr moved to Scandinavia from Novgorod as his brother Yaropolk had murdered his other brothers in order to gain the power in Kyiv. In Sweden and Norway he gathered a Varangian army and took Novgorod from his brother Yaropolk. By 980, Volodymyr had consolidated the Kyiv kingdom from modern-day Ukraine, Belarus and minor parts of modern day Russia.
In 981 he captured the Cherven towns from the Poles. In 981–984 he suppressed and conquered a few Slavic tribes including Vyatychi and Radymychi. In 985 Vololdymyr made a war against the Volga Bulgars.