Abiathar

Tzadok the son of Achituv and Avimelekh the son of Evyatar were cohanim, Shavsha was secretary,

Sh'ma'yah the son of N'tan'el the secretary, one of the L'vi'im, recorded them in the presence of the king, the officers, Tzadok the cohen, Achimelekh the son of Evyatar, and the clan leaders of the cohanim and of the L'vi'im - with two clan divisions taken from El'azar for each one from Itamar.

and after Achitofel were Y'hoyada the son of B'nayah and Evyatar. Yo'av was commander of the king's army.

He entered the House of God when Evyatar was cohen gadol and ate the Bread of the Presence," -- which is forbidden for anyone to eat but the cohanim -- "and even gave some to his companions."