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Philadelphia in Lydia was a young city by ancient standards, founded by Attalid king Eumenes II in the second century BC and named for his brother Attalus II — whose loyalty had earned him the epithet Philadelphos. The city sat on the eastern edge of the Hermus valley along the Royal Road, and when Rome absorbed the Attalid kingdom in 133 BC following Attalus III's bequest, Philadelphia passed into the province of Asia without resistance. This bronze issue spans that entire transition.

Philadelphia was severely damaged by the earthquake of 17 AD, though this denomination predates that event by well over a century.