When we first start the Ascendance of a bookworm Bezewanst is the head of the Temple in Ehrenfest. He is first introduced in the Vol 3 of the series. During the Apprentice Shrine Maiden we works in the background and is mentioned a few times and we only really get to meet him again at the climax of the Apprentice Shrine Maiden.
The High Bishop is sentenced to death by Jilvester for what he has done. Rozemyne is then promoted to the head of the Temple and becomes the High Bishop.Ferdinand is the High Priest while Bezwanst is High Bishop and remain so when Rozemyne takes over.