During the Hellenistic period, the area of Diokaisareia was a part of the Seleucid Empire. The region around Uzuncaburç was controlled by the local kings and queens of Olba on behalf of the Seleucid Empire. Uzuncaburç was the sacred place of the Olba people, but their main settlement was in Ura,4 kilometres (2.5 mi) east of the site of Diokaisareia. However, after the area was captured by the Roman Empire, Emperor Vespasian (r. 69–79) transformed the sacred place to a city, with the right to issue its coins. During the Christian age, most of the temples in Diokaisareia were converted to churches.
During the Middle Ages the city faded away, During the Ottoman Empire the Turkmen people established their own settlement to the east of the ancient site and named their settlement after the Hellenistic tower, Uzuncaburç, which means "tall bastion" in Turkish. Now both the town and the ancient site shares the same name.