The son of Prince Dmitry Vasilyevich of Zaozerye and Princess Maria, from early childhood the saint felt the vanity of worldly life. At the age of 20, he accepted monasticism with the name Joasaph in the Spaso-Kamen Monastery on Lake Kuben. In the monastery, he dedicated all his time to prayer and contemplation of eternity, observing strict fasting.
In the last days of his earthly life, the saint consumed food only once a week and received the Holy Mysteries every Sunday. Living such a God-pleasing life, he attained the highest degrees of perfection and was deemed worthy to see the Lord Himself. After five years of zealous labor, he peacefully departed to the Lord on September 10, 1453, and was buried in the Spaso-Kamen Monastery. Many miracles and healings were performed at the saint's grave.
