When David ascended the throne of Judah, Abiathar was appointed High Priest ( 1 Chr.
15: 11 ; 1 Kings 2: 26 ) and the " king's counselor " ( 1 Chr.
27: 33-34 ).
Meanwhile Zadok, of the house of Eleazar, had been made High Priest.
According to the Jewish Encyclopedia Abiathar was deposed from office when he was deserted by the Holy Spirit without which the Urim and Thummin could not be consulted.
Another version says he was Co-Pontiff with Zadok during King David.
He supported Prince Adonijah over Prince Solomon, and was deposed by him and exiled in Anathoth.