A city of Asia Minor, on the borders of Lydia and Mysia. Its modern name is Ak-hissar, i.e., “white castle.” Here was one of the seven churches ([Rev. 1:11](/rev#Rev.1.11); [2:18-28](/rev#Rev.2.18)). Lydia, the seller of purple, or rather of cloth dyed with this colour, was from this city ([Acts 16:14](/acts#Acts.16.14)). It was and still is famous for its dyeing. Among the ruins, inscriptions have been found relating to the guild of dyers in that city in ancient times.