He was born in Neapolis (Naples) to a pagan father and a Christian mother, and became an officer in the Roman army. Though he was not baptised, his mother had secretly instructed him in the Christian faith. Once, in a battle, his company was completely surrounded by the enemy, and Nikon recalled his mother's counseling that, whenever he was in trouble, he should make the sign of the Cross and call upon Christ. This he did, and was immediately filled with strength and resolution, so that the enemy's army was routed. Nikon went home, openly crying out 'Great is the God of the Christians!' to the great joy of his mother.
  He traveled secretly to Cyzicus in Asia, where the bishop Theodosius baptised him. He then entered a monastery to spend his days in prayer and study. But some years later Theodosius, who was near death, had a vision in which he was told to consecrate Nikon as his successor. He summoned Nikon from the monastery and, to the monk's amazement, immediately ordained him a dea