Read the Life of St. Vladimir here
Vladimir was the grandson of St Olga, and he was the son of Svyatoslav (+ 972).
Liturgical Hymns in Honor of St. Vladimir from the Menaion
Translations copyright by Br. Isaac E. Lambertsen, drawn from the Menaion of the Orthodox Church, in 12 volumes (in English), published by the St. John of Kronstadt Press, 1180 Orthodox Way, Liberty TN 37095; www.sjkp.org. Authorized only for private devotional purposes. Further distribution, reproduction, or incorporation into other documents is prohibited without prior permission from the publisher. All rights reserved.
O Merciful One, Who didst enlighten Paul and make him Thine elect, by Thy baptism Thou hast now also dispelled the affliction of the eyes of Vladimir, the father of Russia.
Thou hast shown thyself to be an imitator of the faithful Constantine, receiving Christ in thy heart; and like an apostle thou hast taught the whole land of Russia His commandments.
Ever keeping vigil in prayer with joyous soul, O Vladimir, thou didst therefore draw forth the wisdom of the Spirit from the wellspring which cometh down from on high. Wherefore, shining like the sun with faith, and praying unceasingly to Christ, haste thou with all speed, O compassionate one, to save the world from transgressions.
Come ye with splendor! Ye children of Russia, lift up your voices, as is meet, to Vladimir our father, and let us all radiantly celebrate his memorial with faith.
Thou didst drive out the ungodliness of thy father and didst love the Orthodox Faith of thy most honored grandmother, O great Prince Vladimir, equal of the apostles of Christ.
O Christ God Who didst of old enlighten Israel with the law of Moses, Thou hast illumined the world by the advent of Thy coming, and hast sent Thy divinely eloquent disciples to preach throughout all lands Thy seedless nativity from the Virgin; and thou didst command them to baptize in the name of the Father, and the Son, and the Holy Spirit. And seeing the Russian land grown old in sin, thou didst send forth Thy Spirit to the soul of the glorious Vladimir, mighty of mind, that he might acknowledge Thee, Christ God, as One of the Trinity, and by Thy baptism might enlighten Thy chosen people, those entrusted by Thee to him, and lead to Thee those who cry out with faith: Deliver Thine inheritance from the heathen foe!
As the grandson of the all-blessed Olga, thou wast confirmed by the love of that new Helena; and thou didst show thyself to be a new Constantine the Great, O Vladimir, crying out to Christ: Blessed art Thou, O God of our fathers!
Choirs of noble princes now stand before thee, bearing the piety received from thee, and praising thee with the faithful people, crying: O speedy guide and helper, be thou mindful of us, that we may find life in peace through thee!
Come, ye people of Russia, let us assemble in the honored church of the holy Vladimir, the all-blessed great prince, the all-glorious favorite of Christ, who was named Basil in baptism; and let us receive life and salvation, grace and great mercy.
With thy glorious grandmother Olga, thou wast truly shown to be a beacon enlightening the whole world with piety and faith, O Vladimir, who art crowned by God. And we glorify Christ Who loved you, and is wondrous in His saints.