Answer
As an impostor, Alexander II Zabinas' claim to the Seleucid throne was illegitimate, as he was not a direct descendant of Seleucus I Nicator, the founder of the Seleucid dynasty. His reign marked a period of instability and conflict within the empire as he faced opposition from various rivals, including the rightful Seleucid heir, Antiochus VIII Grypus.