Saint Isaiah was one of the saints of the Kiev Caves who struggled during the eleventh and twelfth centuries. He was known for his quietness and his unflagging toil, for which he is named a “lover-of-labor.”
The holy ascetic died in the year 1115, and his relics are in the Near Caves of the Kiev Caves Lavra. The commemoration of Saint Isaiah is on May 15, September 28, and on the second Sunday of Great Lent.