Olga (Church Slavonic: Ольга; [ 3 ][ a ] Old Norse: Helga; [ 4 ]c.890–925 – 11 July 969) [ 5 ] was a regent of Kievan Rus' for her son Sviatoslav from 945 until 957. Following her baptism, Olga took the name Elenа. [ b ] She is known for her subjugation of the Drevlians, a tribe that had killed her husband Igor. More @Wikipedia
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