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Saint Olga (c. 890 - 969, Kiev) was a ruler of Kievan Rus' as regent (945–c.963) for her son, Svyatoslav, who was only 3 yrs old when his father died. She was the first Rus' ruler to convert to Christianity, either in 945 or in 957. Olga was one of the first people of Rus' to be proclaimed a saint, for her efforts to spread the Christian religion in the country.However, she failed to convert Svyatoslav, and it was left to her grandson and pupil Vladimir I to make Christianity the state religion.
St. Luke's day - 18 Oct (15th century Byzantine icon, Recklinghausen, Germany; "This is probably the first time this rarely painted theme appeared on an icon.")
Vladimir icon of the Mother of God. According to Tradition, the evangelist, physician and iconographer Luke painted three icons of the Theotokos. When Our Lady looked at them, She said, “May the grace of the One Who was born of me, and my grace, be with these Holy Icons.”
wonderful article - "Saint John, the 'Apostle of Love'" christianorthodox... (John and his disciple Prochorus)