Prince Vladimir the Great, also known as Vladimir I of Kiev, was a ruler of the Kievan Rus' from 980 to 1015. He is best known for his role in the Christianization of the region, which significantly influenced the culture and religion of Eastern Europe. Under his leadership, the Kievan Rus' expanded its territory and strengthened its political power. Vladimir was born around 958 and was the son of Sviatoslav I. He is often credited with establishing the Orthodox Christian faith as the state religion, following his conversion in 988. This pivotal decision helped to unify the diverse peoples of the Kievan Rus' and laid the foundation for the future development of Russia and Ukraine.