Dagon or Dagan was a god worshipped in ancient Syria across the middle of the Euphrates, with primary temples located in Tuttul and Terqa, though many attestations of his cult come from cities such as Mari and Emar as well. In settlements situated in the upper Euphrates area he was regarded as the "father of gods" similar to Mesopotamian Enlil or Hurrian Kumarbi, as well as a lord of the land, a god of prosperity, and a source of royal legitimacy. A large number of theophoric names, both masculine and feminine, attests that he was a popular deity. He was also worshiped further east, in Mesopotamia, where many rulers regarded him as the god capable of granting them kingship over the western areas.

Terqa is the name of an ancient city discovered at the site of Tell Ashara on the banks of the middle Euphrates in Deir ez-Zor Governorate, Syria, approximately 80 kilometres (50 mi) from the modern border with Iraq and 64 kilometres (40 mi) north of the ancient site of Mari, Syria. Its name had become Sirqu by Neo-Assyrian times.