Philadelphia was a city in the province of Asia that was home to one of the seven churches of Revelation.  It is the only one of the seven cities of Revelation that was not a major city in the province of Asia at the time. However, it was on the southern highway connecting Pergamum to south Asia Minor, making it strategically important to settlers and military personnel.

Philadelphia was located in the valley of the Cogamus River, a tributary of the Hermus River, at the foot of Mount Tmolus (modern Bozdağ Mountain). The modern city of Aleşehir, Turkey, currently occupies the site.  The economy at Philadelphia consisted of wool working and the cultivation of grapes for wine.