He was born to pious parents in Tarsia in Bithynia. At the age of twenty he entered monastic life at the Monastery of Agaures near his home. There he became a model of prayer, ascesis and zeal for holiness — he possessed nothing but the cloak he wore, and did not even have his own cell, choosing instead to sleep on the bare ground. When he slept he would not lie on his back or his left side, but always on his right side. In church, he stood repeating 'Lord, have mercy!' to himself throughout the services. He was ordained to the priesthood, and in time was made abbot of the community. But just at that time, Leo the Armenian became Emperor and revived the iconoclast heresy. The monks of Agaures, who held to the Orthodox Faith, scattered to caves and forests to escape persecution. Eustratius himself was imprisoned for a time, and was only able to re-gather the community and resume its direction when Leo died and Orthodoxy was restored in 842.
  As abbot, Eustratius continued to live as th