Coin of Antiochus VI. The reverse shows Castor and Polydeuces on horseback. The Greek inscription reads ΒΑΣΙΛΕΩΣ ΑΝΤΙΟΧΟΥ (king Antiochus). The date ΘΞΡ is 169 of the Seleucid era, corresponding to 144-–143 BC. [Source]

Antiochus VI Dionysus (c. 148-–138 BC) was king of Syria. He was the son of Alexander Balas and Cleopatra Thea, daughter of Ptolemy VI of Egypt.

Antiochus VI did not actually reign. He was nominated in 144 BC by the general Diodotus Tryphon as heir to the throne in opposition to Demetrius II. In 142 BC,Diodotus deposed and succeeded him and in 138 BC killed him.

Seleucid Ruler 145-–142 BC
Preceded by: Alexander Balas
Succeeded by: Diodotus Tryphon