Christianity reached the area in the 3rd century, and at the end of the 4th century, the temple of Augustus was decommissioned. Perhaps as a sign of the rise of Christianity in Pessinus, Emperor Julian the Apostate made a pilgrimage to Pessinus and wrote an angry letter concerning the disrespect shown to the sanctuary of Cybele. In ca. 398, Pessinus was established as the capital of the newly established province of Galatia Salutaris (in the civil Diocese of Pontus), and became the seat of a Metropolitan Archbishop. The region later became part of the Byzantine Anatolic Theme.