Peter served as cleric in the Slavonian town of Đakovo, the residence of the bishops of Bosnia since they were exiled from Bosnia itself in the previous century.
Peter was chosen to succeed the Franciscan Peregrin Saxon on the episcopal throne following the latter's death in January 1356.
Peter was one more in the series of absent bishops whose authority was eclipsed by Bosnian Franciscans.
He actively supported the calls for a new crusade against Bosnia, earning him Tvrtko's hostility.
[2] The Ban even attempted to plot against him, corresponding to that end with a lector in Đakovo.