Saint Peter of Galatia left home at the age of seven, then spent the rest of his life in ascetical labors as a monk. At first, he remained in Galatia, then went to Palestine. Later, he went to Antioch. There he enclosed himself in a tomb, devoting himself to deeds of prayer and strict abstinence. He partook of bread and water only every other day. Because of his holy life, God granted him the gift of wonderworking, healing infirmities and expelling devils.

St Peter died around the year 429 at the age of ninety-nine. His Life was written by Theodoret of Cyrrhus, whose mother had been healed by the saint.

This St Peter should not be confused with the other StPeter of Galatia, who is commemorated on October 9.