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Sassanids | Syria | Christianity | Zenobia | Commerce | Hellenistic states | Limes
City on the west bank of the middle Euphrates (Arab. aṣ-Ṣāliḥiya, south-eastern Syria). D.-E. was founded c. 300 BC by Macedonian colonists as one of the Seleucid fortresses for securing links to the Euphrates. After the Parthian conquest c. 141 BC it rose to become a military station and important staging post on the caravan route to Palmyra. Trajan's advances against Mesopotamia restored the status of D.-E. as a Roman garrison city on the Syrian li…