聖イシュトヴァーンの王冠
He became archbishop of Esztergom on 8 January 1440. In this capacity, he crowned the infant Ladislaus the Posthumous with the Holy Crown of Hungary on 15 May 1440. However, shortly afterward he joined the league of Vladislaus I, whom he crowned on 17 July 1440 with a crown from Saint Stephen's reliquary.