Olga is the East Slavic form of the Old Norse Helga ("holy, blessed"). **Saint Olga of Kiev (c. 890-969)** was the **regent of Kievan Rus' (945-963) and the first Christian ruler of what would become Russia** — baptized in Constantinople in 957, she set the stage for her grandson Vladimir's mass conversion of Rus' in 988. **Famous in chronicle for her brutal revenge against the Drevlians who killed her husband Igor** — she burned their capital using sparrows and pigeons carrying smoldering sulfur. **One of the few female saints honored as "Equal-to-the-Apostles."**
Subject of icons throughout Eastern Orthodox Christianity.
Olga reduces to six — the number of Kievan regent.