Olga of Kiev

Olga of Kiev was a powerful 10th-century ruler and regent of Kievan Rus, known for her intelligence, political acumen, and ruthless retribution against those who wronged her. After the murder of her husband, Igor, by the Drevlians, she famously avenged his death in a series of calculated acts, ultimately leading to the establishment of her son, Svyatoslav, on the throne. Her legacy includes the promotion of Christianity in her realm and her recognition as a saint in the Eastern Orthodox Church.