She married her distant maternal cousin , the Seleucid general Achaeus .
Her sister was Laodice III , the first wife of Antiochus III the Great , and her brother was Mithridates III of Pontus .
Mithridates III of Pontus married Mithridates III of Pontus ' distant maternal cousin , the Seleucid general Achaeus .
Her sister was Laodice III , the first wife of Antiochus III the Great , and her brother was Mithridates III of Pontus .