St. John, named Chrysostom (golden-mouthed) on account of his eloquence, came into the world of Christian parents, about the year 344, in the city of Antioch. His mother, at the age of 20, was a model of virtue. He studied rhetoric under Libanius, a pagan, the most famous orator of the age.
In 374, he began to lead the life of an anchorite in the mountains near Antioch, but in 386 the poor state of his health forced him to return to Antioch, where he was ordained a priest.
Read more at Catholic.org.