The homonoia between two cities of the Greek world was the
proclamation of an "agreement" or commonality of interests,
almost like the "sister-city" arrangements between modern
cities. While the Leagues of Greek cities were primarily
military alliances, a homonoia was a union based on political,
economic and religious connections. The cities of Asia Minor
preserved this tradition under the Romans, with an extensive
interlinked system of alliances. The earliest coins marking
these agreements appear under Domitian, but the majority come
later, dating from the Severan period through the end of
provincial coinage in the late 3rd century AD. Ephesus seems to
have been the most sought after party to these unions, a
popularity undoubtedly associated with its status as the
principal cult center of Artemis. Pergamum was the political
nexus of Asia Minor, and also appears frequently among the
unions. The eminence of Cyzicus is surely due to its traditional
role as the economic powerhouse of the Propontis, dominating th