Founded between the 25th and 20th centuries BCE by Sumerian merchants from Ur, the city of Harran grew into a key religious and commercial hub in Upper Mesopotamia. From early on, it became a cult center for the moon deity Sin (also called Nanna), featured the great temple Eḫulḫul, and had royal patronage across the Assyrian, Babylonian, and Persian periods. Even after becoming the capital of Islamic dynasties, Harran's moon cult endured into the 11th century AD, until its pagan institutions were dismantled under Islamic rule. The Mongol conquest of 1260-1271 AD devastated the city, leaving it largely abandoned until a modest revival in the 19th and 20th centuries.
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