Family and Betrothal
The tradition identifies Euphrosyne as the eldest daughter of Prince Michael of Chernigov and his wife Theophania, who are said to have prayed for children at the Kiev Caves monastery. Her father is himself venerated as a martyr, having been killed for refusing to perform pagan rites before the Mongol khan.
By tradition she was betrothed to Prince Theodore, a brother of Saint Alexander Nevsky, but he died before the wedding. The synaxarion presents this loss as the turning point that led her to withdraw from the world and seek the monastic life.