Metropolis of Pergamon
The Metropolis of Pergamon () was an ecclesiastical territory (diocese) of the Ecumenical Patriarchate of Constantinople in western Asia Minor, modern Turkey. Christianity in the city of Pergamon (modern Bergama), was introduced already from 1st century AD, while the local Christian community comprised one of the seven Churches of Asia mentioned at the Book of Revelation, written by John of Patmos. The bishopric of Pergamon was twice promoted to a metropolis: during the 13th–14th centuries, as well as for a short period in 1922. Today the "Metropolis of Pergamon and Adramyttium" is the see of a titular metropolitan.
Pergamon
The earliest mention of Pergamon in literary sources comes from Xenophon's Anabasis, since the march of the Ten Thousand under Xenophon's command ended at Pergamon in 400/399 BC. Xenophon, who calls the city Pergamos, handed over the rest of his Greek troops (some 5,000 men according to Diodorus) to Thibron, who was planning an expedition against the Persian satraps Tissaphernes and Pharnabazus, at this location in March 399 BC. At this time Pergamon was in the possession of the family of Gongylos from Eretria, a Greek favourable to the Achaemenid Empire who had taken refuge in Asia Minor and obtained the territory of Pergamon from Xerxes I, and Xenophon was hosted by his widow Hellas.