ef'e sus, an ancient Greek city of Lydia, in Asia Minor, one of the twelve Ionian cities on the south side of the Cayster, near its mouth. It was at one time the emporium of western Asia, having a convenient and spacious harbor. During the time of the Roman emperors it was especially prosperous. Some interesting remains of ancient times have recently been discovered by excavation, including those of a magnificent theater, a stadium and a temple of Diana (See DIANA, TEMPLE OF). Several church councils were held here. The site of the city is now desolate; near it is a poor village, Aiasoluk.