Antiochus IX Cyzicenus

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Antiochus IX Cyzicenus
Antiochus IX Eusebes Cyzicenus
Tetradrachm of Antiochos IX, with Athena Nike on the reverse, minted at Antioch circa 110-109 BC.[1]
King of the Seleucid Empire (King of Syria)
Reign	116 BC–96 BC (with his brother Antiochus VIII Grypus)
Predecessor	Antiochus VIII Grypus
Successor	Seleucus VI Epiphanes
Born	Unknown
Died	96 BC
Spouse	Cleopatra IV (married c. 115–112 BC) Cleopatra Selene of Syria (married 96 BC)
Issue	Antiochus X Eusebes
Dynasty	Seleucid
Father	Antiochus VII Sidetes
Mother	Cleopatra Thea

Antiochus IX Eusebes Cyzicenus (Greek: Ἀντίοχος Εὐσεβής Κυζικηνός, "Antiochus the Pious, the Cyzicene") was a ruler of the Hellenistic Seleucid kingdom. He was the son of Antiochus VII Sidetes and Cleopatra Thea.^[2] He left the kingdom in 129 BC and went to the city of Cyzicus, but he returned in 116 BC to challenge his half-brother Antiochus VIII for power.

The siblings fought a twenty-year civil war. In 112 BC, Antiochus IX's wife, Cleopatra IV, was killed by her sister Tryphaena, the wife of Antiochus VIII. Tryphaena herself died shortly afterwards. Antiochus VIII was assassinated in 96 BC; he was succeeded by his sons Seleucus VI and Demetrius III. Antiochus IX then took the capital Antioch and married his deceased wife's sister Cleopatra Selene, who was herself the widow of Antiochus VIII. Seleucus VI continued the war against his uncle. Antiochus IX Eusebes Cyzicenus was killed in battle in 96 B.C.