Prince Vladimir of Kiev, also known as Vladimir the Great, was a ruler of the Kievan Rus' from 980 to 1015. He is best known for his role in the Christianization of the region, converting to Christianity and establishing it as the state religion. This significant change helped to unify the diverse tribes under his rule and strengthened ties with Byzantine Empire. Vladimir was also a skilled military leader and expanded the territory of Kievan Rus'. He is credited with establishing a legal code and promoting trade, which contributed to the economic development of the region. His legacy is celebrated in Eastern Orthodox Christianity and he is recognized as a saint.