Gaius Julius Antiochus IV Epiphanes (Ancient Greek: Γάιος Ἰούλιος Ἀντίοχος ὀ Ἐπιφανής, before 17 AD – after 72 AD), the last king of Commagene, reigned between 38–72 as a client king to the Roman Empire.
Antiochus was born a prince of the royal family of Commagene. His parents King Antiochus III of Commagene and Queen Iotapa were full-blooded siblings who had married each other. The younger Antiochus himself would marry his full-blooded sister Iotapa. Antiochus was of Armenian,Greek and Median descent. Through his ancestor from Commagene, Queen Laodice VII Thea, who was the mother of King Antiochus I Theos of Commagene, he was a direct descendant of the Greek Seleucid kings.
Antiochus appears to have been very young when his father died in 17. The Roman emperor Tiberius agreed with the citizens of Commagene to make their kingdom a part of the Roman province of Syria. Between 17 and 38, Antiochus seems to have gained Roman citizenship. He lived and was raised in Rome, along with his sister. While he and his sister were growing up in Rome, they were part of the remarkable court of Antonia Minor, a niece of the first Roman emperor Augustus and the youngest daughter of the triumvir Mark Antony. Antonia Minor was a very influential woman and supervised her circle of various princes and princesses. Her circle assisted in the political preservation of the Roman Empire’s borders and affairs of the client states.
Antiochus IV Epiphanes (/ænˈtaɪ.əkəs ɛˈpɪfəniːz/; Ancient Greek: Ἀντίοχος Δ΄ ὁ Ἐπιφανής, Antíochos D' ho Epiphanḗs, "God Manifest"; c. 215 BC – 164 BC) was a Hellenistic Greek king of the Seleucid Empire from 175 BC until his death in 164 BC. He was a son of King Antiochus III the Great. His original name was Mithradates (alternative form Mithridates); he assumed the name Antiochus after he ascended the throne.
Notable events during the reign of Antiochus IV include his near-conquest of Egypt, his persecution of the Jews of Judea and Samaria, and the rebellion of the Jewish Maccabees.
Antiochus was the first Seleucid king to use divine epithets on coins, perhaps inspired by the Bactrian Hellenistic kings who had earlier done so, or else building on the ruler cult that his father Antiochus the Great had codified within the Seleucid Empire. These epithets included Θεὸς Ἐπιφανής 'manifest god', and, after his defeat of Egypt, Νικηφόρος 'bringer of victory'. However, Antiochus also tried to interact with common people by appearing in the public bath houses and applying for municipal offices, and his often eccentric behavior and capricious actions led some of his contemporaries to call him Epimanes ("The Mad One"), a word play on his title Epiphanes.