 In 1761, Maria Theresa appointed him administrator-for-life of the Bishopric of Vác, and at the same time obtained the cardinal's red for him from Clement XIII.Migazzi was thus in possession of two sees, the revenues of which he applied to their improvement.In Vác (Waitzen), he erected the cathedral and episcopal palace and founded the "Collegium pauperum nobilium" and a convent.