However, in 175 BCE, Onias III was dismissed from the High Priesthood and his brother Jason was given the role instead. It is not entirely clear why; possibly Jason offered a larger tribute to King Antiochus IV Epiphanes, possibly Onias III was seen as too friendly to the Ptolemaic dynasty, which had recently ruled Judea and aimed to reclaim it which would eventually become the Sixth Syrian War in 170 BCE.
However, in 175 BCE, Onias III was relieved of his duties as High Priest and his brother Jason took over instead. It is unclear why; possibly Jason offered a greater tribute to King Antiochus IV Epiphanes, possibly Onias III was viewed as too amicable towards the Ptolemaic dynasty, which had recently governed Judea and sought to reclaim it, leading to the Sixth Syrian War in 170 BCE.