Life and Captivity
Eustratius was born in the eleventh century into a wealthy Kiev family. According to his life, he distributed his fortune to the poor and entered the Kiev Caves Monastery, where he gave himself to rigorous ascetic discipline and was noted for his fasting.
In 1096 Polovtsian forces attacked Kiev, devastated the Caves monastery, and enslaved many of its monks. Eustratius and a company of others—numbering about fifty, including both monastic laborers and townspeople—were taken to Korsun and sold to a Jewish merchant.