Antiochus (221 BC–193 BC) was aSeleucid prince, first-born child to the Seleucid monarchsAntiochus III the Great andLaodice III, and his father's first heir.^[1]

Antiochus was ofGreek Macedonian andPersian descent. In 210 BC, his father made him joint king, when Antiochus III went off to the East on his great expedition. He was partly in command of the Seleucid army at the victory at Panion in 200 BC.^[2] He is not recorded to have had any real independent authority, but he was appointed viceroy of the eastern Seleucid satrapies. Antiochus is named in several decrees and letters with his father.^[2]

In 200 BC, Antiochus was present at thebattle of Panium and received the command over the right wing of the cavalry; it was he who routed the Egyptian cavalry and attacked the Ptolemaic center from the rear with his victorious cavalry.^[3] In 196 BC, Antiochus was appointed as the heir to the Seleucid throne.^[4] In that year, his father arranged for him to marry his younger sisterLaodice IV.^[1] The marriage between Laodice IV and Antiochus was the first sibling marriage to occur in the Seleucid dynasty.^[2] From their sibling union, Laodice IV bore Antiochus a daughter calledNysa.^[5]

In 193 BC, Antiochus III appointed his daughter, the sister-wife of his son, Antiochus, as the chief priestess of the state cult dedicated to their late mother Laodice III inMedia.^[6] Later that year, Antiochus died. His family were in complete grief of his death, in particular Antiochus III.^[2] Antiochus was succeeded by his younger brotherSeleucus IV Philopator.^[4]

• List of Syrian monarchs
• Timeline of Syrian history

• J.D. Grainger, A Seleukid prosopography and gazetteer, BRILL, 1997

• 2nd-century BC Seleucid monarchs
• 3rd-century BC Seleucid monarchs
• Greek people of Iranian descent

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• Short description matches Wikidata