Olga

Chambers's Encyclopaedia, Volume 7: Maltebrun to Pearson, p. 596

Olga, St, a saint of the Russian Church, wife of the Scandinavian (Varangian) Duke Igor of Kieff, who, after her husband's death (946), governed during the minority of her son, till 955. Thereafter she repaired to Constantinople, and was baptised, assuming the name of Helena. Returning to Russia, she laboured with much zeal for the propagation of her new creed. After her death (968) she was canonised, and is now held in high veneration in the Russian Church. Her festival is held on July 21.

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