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Dorylaeum (dŏrĬlē´əm), ancient city of N Phrygia, Asia Minor, now in NW Turkey. It was an important trading city of the Romans but later fell to ruins. At this site on July 1, 1097, the Christians of the First Crusade defeated the Seljuk Turks. Many scholars hold that the modern Eskisehir is near the site, but the question has not been settled.