Antiochus XII DionysusAntiochus XII Dionysus
) was the fifth son of Antiochus VIII Grypus
to take up the diadem, and succeeded his brother Demetrius III Eucaerus
as separatist ruler of the southern parts of the last remaining Seleucidian realms, basically Damascus
and its surroundings. He initially gained support from Ptolemaic
forces but was killed in a campaign against the Nabataean
Arabs, who conquered Damascus soon after.