He spent most of his tenure in Rome as a representative of John Zápolya, the contested king of Hungary and an Ottoman subject.
Bogantius was an archdeacon in Pécs and a secretary and a diplomat of John Zápolya, the contested king of Hungary who controlled the eastern realms as an Ottoman subject.
[1] In 1536, Zápolya sent him to Rome to get approval for the appointment of János Statileo as the Bishop of Transylvania.
[3] From 1536, Bogantius spent his time in Rome in the papal courts as the representative of Zápolya and the Transylvanian clergy.
After Zápolya died in 1540, Pope Paul III appointed him the assistant to the papal vicar for Rome, a duty he exercised from 1541 to 1544.