Stephen occupied Koppány's duchy and granted large estates to his own partisans. He also prescribed that Koppány's former subjects were to pay tithes to the Pannonhalma Archabbey, according to the deed of the foundation of this monastery which has been preserved in a manuscript containing interpolations. The same document declares that "there were no other bishoprics and monasteries in Hungary" at that time. On the other hand, the nearly contemporary Bishop Thietmar of Merseburg stated that Stephen "established bishoprics in his kingdom" before being crowned king. If the latter report is valid, the dioceses of Veszprém and Győr are the most probable candidates, according to historian Gábor Thoroczkay.