Jason (Hebrew: Yason, יאסון) of the family, brother to Onias III, was a High Priest in the Temple in Jerusalem. Josephus records that his name, before he hellenised it, was originally Jesus (Hebrew יֵשׁוּעַ Yēshua`).
Jason became high priest in 175 BCE after the accession of Antiochus Epiphanes to the throne of the Seleucid Empire.
In an ongoing dispute between the current High Priest, Onias III, and Simon the Benjamite, Jason offered to pay Antiochus in order to be confirmed as the new High Priest in Jerusalem. Antiochus accepted the offer and further allowed Jason to build a gymnasium in Jerusalem and create a Greek-style Polis named after the king, Antioch.
With the creation of Antioch, Jason abandoned the ordinances given under Antiochus III, which defined the polity of the Judeans according to the Torah.
Jason's time as High Priest was brought to an abrupt end in 171 BCE when he sent Menelaus, the brother of Simon the Benjamite, to deliver money to Antiochus. Menelaus took this opportunity to "outbid" Jason for the priesthood, resulting in Antiochus confirming Menelaus as the High Priest. Jason fled Jerusalem and found refuge in the land of the Ammonites.
In 168 BCE Jason made a failed attempt to regain control of Jerusalem. Fleeing again to Ammon, he then continued to Egypt, then finally to Sparta, where he died and was buried