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İlyas Bey Mosque located in Miletus Ancient City, 22 km. away from Didim District was built on İlyas Bey of Menteshe’s order in the 15th century. The mosque, that is located in a Külliye consisting of a tekke (Islamic monastery), bathhouse, caravanserai and a tomb, is an important structure which survived until today with its original architecture and ornaments. The marbles that had been used in its construction were from the ruins of the ancient city of Miletus.