Heidegger's Bible Handbook: Galatians: Inscription
1. The Inscription of the Epistle. The Galatians, Gallo-Greeks.
Among the shorter Epistles of Saint Paul the first was written πρὸς Γαλάτας, to the Galatians. Galatia was a province of Asia Minor, of which the Gallic inhabitants, immigrants after rising of Rome, mixing themselves with the Paphlagonian Greeks, were first called Gallo-Greeks, and Greco-Gauls, and afterwards Galatians. By Augustus they were reduced into the form of a Province, and received a Roman Prefect. Unto the same Peter wrote, calling them ἐκλεκτοὺς παρεπιδήμους διασπορᾶς, elect strangers of the diaspora, 1 Peter 1:1, which is to be understood of the Jews.
 1 Peter 1:1: “Peter, an apostle of Jesus Christ, to the elect strangers scattered (ἐκλεκτοῖς παρεπιδήμοις διασπορᾶς) throughout Pontus, Galatia, Cappadocia, Asia, and Bithynia…”