Wednesday after the sixth Sunday after Trinity

Olga (c. 890–969) was the wife of Igor I, Grand Prince of Kiev. When Igor was murdered by the Drevlians (a tributary Slavic tribe) in 945, Olga took power as regent for their young son Sviatoslav and proved herself one of the ablest rulers of the medieval period. The Primary Chronicle records her vengeance against the Drevlians with graphic and possibly legendary detail: according to one account, she trapped the Drevlian princes in a bath and burned them; in another, she supposedly arranged for 5,000 Drevlian warriors to be buried alive. Whether these accounts are historical or literary embellishment, they establish Olga's reputation as a formidable political actor. She then reorganized the tax and tribute system of the realm, strengthened its military and administrative structures, and governed with a skill that earned the respect of both Constantinople and the Western Empire.

Around 957, Olga traveled to Constantinople (probably on a diplomatic mission to formalize relations with the Byzantine Empire and negotiate for Rus military assistance), where she was baptized. Byzantine sources indicate she was received with great ceremony by the Emperor Constantine VII himself. She took the Christian name Helga and reportedly received Constantinople's highest honor for foreign rulers—elevation to the status of 'daughter of the emperor.' She returned to Kiev with the intention of establishing Christianity in the realm, but her efforts were frustrated by her son Sviatoslav, who had inherited his father's pagan commitments and maintained the old religious cult. Olga had considerable influence but lacked the absolute authority to impose Christianity on the whole realm.

Vladimir I (c. 958–1015), Olga's grandson, became Grand Prince of Kiev in 980 after a brutal succession struggle involving his older half-brothers. The Primary Chronicle portrays him in his early years as a man of massive appetites and violent temperament—maintaining a harem of several hundred concubines and ruthlessly eliminating rivals. According to the Chronicle, Vladimir investigated the major religious traditions of his neighbors—Islam (from the Khazars and Volga Bulgars), Judaism (from the Khazars), Western Christianity (from the Germans and Poles), and Byzantine Orthodox Christianity—and chose Orthodoxy after his envoys attended the Divine Liturgy in the Hagia Sophia. The Chronicle records their report: 'We knew not whether we were in heaven or on earth, for on earth there is no such splendor or such beauty, and we are at a loss how to describe it.'

The political context was equally important. Vladimir's baptism in 988 was connected to a military alliance with the Byzantine Emperor Basil II, who was suppressing a rebellion and needed Varangian (Viking) troops. Vladimir provided 6,000 soldiers to help Basil, and in exchange, the emperor arranged for Vladimir to marry his sister Anna—an unprecedented honor, as Byzantine emperors almost never allowed their sisters to marry foreign rulers. The marriage required Vladimir's baptism according to Byzantine law. Anna arrived in the Crimean city of Cherson (which Vladimir had conquered), and they were married in the cathedral there.

After his conversion, Vladimir ordered the mass baptism of Kiev. The Primary Chronicle reports that the population waded into the Dnieper River while pagan idols were toppled into the water. While the immediacy and comprehensiveness of this account is debated by modern historians (conversion of a whole realm was likely more gradual), the symbolic importance of the baptism and Vladimir's subsequent promotion of Christianity is clear from Byzantine and contemporary sources. He built churches, invited Greek clergy and teachers, and promoted the translation of Byzantine liturgical texts into Old Church Slavonic. The civilization that emerged—Byzantine in theology, liturgy, and political ideology; Slavic in language, culture, and personality—shaped the religious identity of Russia, Ukraine, and Belarus for the next thousand years. Vladimir married four times and had at least twelve children, many of whom became bishops or abbesses, establishing Christianity throughout his realm.

Olga is called 'isapostolos' (equal to the apostles) in Eastern Orthodox tradition and is remembered as 'the first ray of dawn before the sun of Orthodoxy'—a poetic way of describing her role in preparing the way for Vladimir's conversion. She is venerated as a saint in both the Orthodox and Catholic traditions.

Vladimir's conversion story, with its comparison of religions and the dramatic report from Constantinople, is the most famous version preserved in the Primary Chronicle. The story has become part of Slavic Christian identity and memory. According to the Chronicle, after his conversion, Vladimir became extraordinarily generous—distributing food and drink to the sick and needy, hosting feasts for the poor, and reportedly refusing to execute criminals. The Chronicle records: 'He began to gather priests and to establish the Christian faith.' Whether this moral transformation was as complete or immediate as the Chronicle suggests, the narrative became normative in Orthodox remembrance of Vladimir and was used as a template for conversion stories of other Slavic rulers.

Both Olga and Vladimir are venerated as 'Enlighteners' (Просветители) of the Slavic peoples. Their feast day in Orthodox tradition is July 15. In Western tradition (including ACNA), they are commemorated under similar titles.