What is "mattathias"

Mattathias ben Johanan (, Matityahu ben Yoḥanan HaKohen) (died 165 BCE) was a Kohen (Jewish priest) whose role in the religion-driven Maccabean Revolt against the pagan Greek Seleucid Empire is related in the Books of the Maccabees. Mattathias is accorded a central role in the story of Hanukkah and, as a result, is named in the Al HaNissim prayer Jews add to the Birkat Hamazon (grace after meals) and the Amidah during the festival's eight days.