Letter of Paul to the Galatians, also called Epistle of St. Paul the Apostle to the Galatians, abbreviation Galatians, ninth book of the New Testament, written by St. Paul the Apostle to Christian churches (exact location uncertain) that were disturbed by a Judaizing faction. Paul probably wrote the epistle from Ephesus about 50-52 C.E. to a church he had founded in the territory of Galatia, in Asia Minor.