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.
Meanwhile, around 175 BCE, Onias III was removed from his position as High Priest and replaced by his brother Jason. The reasons behind this decision are unclear; one possibility is that Jason provided a more substantial tribute to King Antiochus IV Epiphanes, or perhaps Onias III was seen as too sympathetic towards the Ptolemaic dynasty, which had recently ruled Judea and aimed to regain control, ultimately contributing to the Sixth Syrian War in 170 BCE.