Olympia and Euphrosyne were two monastic women of the convent at Therme on the island of Lesbos who were put to death for Christ in the thirteenth century. They are commemorated together as a single named pair on May 11, the day of their martyrdom, and are numbered among the venerable-martyrs of the Orthodox Church.
According to the synaxarion, Saint Olympia came from Constantinople, where her father was a priest. After her parents died when she was about ten years old, relatives sent her to the Karyes Monastery at Therme on Lesbos, where she was raised in the monastic life. She is said to have become abbess (igoumeness) of the community at the age of twenty-five.
About a decade into her leadership, on May 11, 1235, pirates landed on Lesbos and came to the monastery, where some thirty nuns were living. While a number of the sisters fled to the mountains, Olympia and Euphrosyne remained and were seized. The two were tortured and killed for refusing to renounce their faith.