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city and Mediterranean port, southwestern Turkey, on the Gulf of Antalya. Attalia was founded as a seaport in the 2nd century BC by Attalus II, a king of Pergamum. It was bequeathed to the Romans by his successor, Attalus III. St. Paul and St. Barnabas embarked from the seaport on their evangelical mission to Antioch. The "Hadrian Gate," a marble portal of three identical arches, was built to commemorate a visit by Hadrian in AD 130.