The Monk Auxentius, by origin a Syrian, served at the court of the emperor Theodosius the Younger (418-450). He was known as a virtuous, learned, and wise man, and he was moreover a friend of many of the pious men of his era.

Distressed by worldly vanity, Saint Auxentius accepted the dignity of presbyter, and then received monastic tonsure. Setting off after this to Bithynia, he found a solitary place on Mount Oxus, not far from Chalcedon, and there he began the life of a hermit. (This mountain was afterwards called Auxentian). The place of the saint’s efforts was stumbled upon by shepherds, seeking after lost sheep. They spread the news about him, and people began to come to him for healing. With the Name of God, Saint Auxentius healed many of the sick and the infirm.

In the year 451 Saint Auxentius was invited to the Fourth Ecumenical Council at Chalcedon, where he became known as a denouncer of the Eutychian and Nestorian heresies. He was greatly familiar with Holy Scripture, and Saint Auxentius easily bested those opponents who entered into dispute with him. After the finish of the Council, Saint Auxentius returned again to his solitary cell on the mountain. By means of spiritual sight he saw the end of Saint Simeon the Pillar-Dweller (459), from over a great distance.

The Monk Auxentius himself died in about the year 470, leaving behind him disciples and many monasteries constructed in the Bithynian region.