Oporowski's nomination did not change the situation in Warmia. The nominee was not allowed to assume his office because of protests from the clergy and people of Warmia and the Prussian Estates. At the same time, Nicolaus of Tüngen began to strive to obtain his desired bishopric. Supported by the Teutonic Knights, Tüngen gained control of most of Warmia's castles and towns. He also gained the support of the king of Hungary, Matthias Corvinus, then in conflict with Poland, entrusting him with protecting the bishopric.