DEMETRIUS (d. 88 B.C.), called Euergetes and Philometor, was the son of Antiochus VIII. Grypus. By the assistance of Ptolemy X. Lathyrus, king of Egypt, he recovered part of his Syrian dominions from Antiochus X. Eusebes, and held his court at Damascus. In attempting to dethrone his brother, Philip Epiphanes, he was defeated by the Arabs and Parthians, was taken prisoner, and kept in confinement in Parthia by King Mithradates until his death in 88 B.C.