Saint Athanasius I, Patriarch of Constantinople (1289-1293; 1303-1311), in the world Alexius, was from Adrianopolis. While still in his youth, thriving upon the knowledge of the wisdom of Christ, he left his home and went to Thessalonica, where he was tonsured in one of the monasteries with the name Acacius. He soon withdrew to Mount Athos and entered the brethren of the Esphigmenou monastery, where for three years he served in the trapeza. In his works and his ascetic deeds he acquired the gift of tears, and by his virtuous acts he won the overall goodwill of the brethren.
Shunning praise, Acacius humbly left Mt. Athos at first for the holy places in Jerusalem, and then to Mount Patra, where for a long time he lived ascetically as an hermit. From there the ascetic transferred to the Auxention monastery, and then to Mount Galanteia to the monastery of Blessed Lazarus, where he accepted the great angelic schema with the name Athanasius, was ordained a priest and became ecclesiarch (monk in charge of the sacred relics and vessels in the church). Here the saint was granted a divine revelation: he heard the Voice of the Lord from a crucifix, summoning him to pastoral service.
Wishing to strengthen his spirit still more in silence and prayer, St Athanasius again settled on Mount Athos after ten years. But because of disorders arising there he returned to Mount Galanteia. Here also he was not long to remain in solitude. Many people thronged to him for pastoral guidance, and so he organized a women's monastery there.
During this time the throne of the Church of Constantinople fell vacant after the disturbances and disorder of the period of the Patriarch John Bekkos. At the suggestion of the pious emperor Andronicus Paleologos, a council of hierarchs and clergy unanimously chose St Athanasius to the Patriarchal throne of the Church in 1289.
Patriarch Athanasius began fervently to fulfill his new obedience and did much for strengthening the Church. His strictness of conviction roused the dissatisfaction of influential clergy, and in 1293 he was compelled to resign the throne and to retire again to his own monastery, where he lived an ascetic life in solitude. In 1303 he was again entrusted with the staff of patriarchal service, which he worthily fulfilled for another seven years. In 1308 St Athanasius established St Peter as Metropolitan of Kiev and All Rus (December 21).
Again, because of some sort of dissatisfaction, and not wanting to be the cause of church discord, St Athanasius resigned the governance of the Church in 1311. He departed to his own monastery, devoting himself fully to monastic deeds.
Toward the end of his life, the saint was again found worthy to behold Christ. The Lord reproached him because Athanasius had not carried out his pastoral duty to the end. Weeping, the saint repented of his cowardice and received from the Lord both forgiveness and the gift of wonderworking. St Athanasius died at the age of 100.