Antiochus - Greek Antiochus III the Great, (Greek Ἀντίoχoς Μέγας; ca. 241–187 BC, ruled 222–187 BC), younger son of Seleucus II Callinicus, became the 6th ruler of the Seleucid Empire as a youth of about eighteen in 223 BC. His traditional designation, the Great, reflects an epithet he briefly assumed after his Eastern Campaign (it appears in regnal formulas at Amyzon in 203 and 202 BC, but not later). Antiochos also assumed the title"Basileus Megas" (which is Greek for Great King), the traditional title of the Persian kings, which he adopted after his conquest of Koile Syria Antiochus III inherited a disorganized state. Not only had Asia Minor become detached, but the further eastern provinces had broken away, Bactria under the Greek Diodotus of Bactria, and Parthia under the nomad chieftain Arsaces. Soon after Antiochus's accession, Media and Persis revolted under their governors, the brothers Molon and Alexander