Conversion to Orthodoxy
By tradition, Vladimir sent envoys to various countries to determine which religion would best suit his people. The envoys who attended the Divine Liturgy at Hagia Sophia in Constantinople returned amazed, reporting, in the words preserved by the chronicles, that they no longer knew whether they were in heaven or on earth.
Several influences are credited with shaping his conversion: the example of his grandmother, the Holy Princess Olga; the Christian faith of his mother, Malusha; and, by one account, his witnessing the martyrdom of Saints Theodore and John in 983.
Vladimir captured Korsun (Chersonesos) to compel the Byzantine emperors to honor their promise to send Princess Anna and clergy. He was baptized there, taking the name Basil, and married Anna. Priests then baptized the people of Kyiv at the confluence of the Khreshchatyk River with the Dnieper. Christianization spread rapidly in Kyiv but advanced more slowly in northern regions such as Novgorod, Rostov, and Murom.
Reforms and Contributions
After his baptism Vladimir destroyed the pagan idols he had earlier erected and replaced them with churches. He introduced Byzantine law with humanitarian modifications, abolished capital punishment — reportedly saying, 'I am afraid of sin' — and abolished judicial torture and mutilation.
He founded churches and schools, established ecclesiastical courts, distributed charity to the poor, and ordered that the children of nobles be educated. Sources describe him as actively serving the poor, the sick, and the disadvantaged, and as setting aside his former life of many wives to live with one wife. His spiritual transformation has been likened to that of the Apostle Paul.
Family
Vladimir was a grandson of the Holy Princess Olga and a son of Prince Sviatoslav I and Malusha. Before his conversion he had many wives and concubines, including Allogia, Rogneda of Polotsk (later the nun Anastasia), Irina (widow of Yaropolk I), Adela, Malfrida, and a granddaughter of Otto the Great; after his baptism he married Anna Porphyrogenita.
His sons included Sviatopolk I, Yaroslav the Wise, Boris, Gleb, and Mstislav of Chernigov. His sons Boris and Gleb became the first Russian saints to be canonized.
Relics & Shrines
Vladimir was buried in the Church of the Tithes in Kyiv. His body was distributed among his sacred foundations and venerated as relics, and a portion was kept in the Cathedral of Holy Wisdom (Hagia Sophia of Kyiv), established by his son Yaroslav.
Veneration
Vladimir is venerated as Equal-to-the-Apostles, and is commemorated by both the Eastern Orthodox and the Catholic Church on July 15 (15/28 July); he is also commemorated on the second Sunday of Great Lent.
By tradition, Saint Alexander Nevsky instituted Vladimir's feast after his victory at the Neva River in 1240, attributing his success to Vladimir's intercession.