The Temple of Zeus Hypsistos is an ancient Roman temple dedicated to the god Zeus, located in the present day town of Al-Dumayr, Syria, located 45 km north-east of Damascus, and known historically as Thelsea.Millar 1993 p. 317
History While its construction date is unknown, it was probably a Nabatean building, likely converted to a temple around the 2nd century.
In one of its inscriptions, it mentions a case heard by Emperor Caracalla in Antioch around 216, about the corruption in the temple's priesthood.
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References
Sources Millar, Fergus (1993). The Roman Near East, 31 B.C.-A.D. 337. p. 317. .