Santa Maria in Domnica
As cardinal, he attended a few sessions of the Council of Trent. He was also a participant in the papal conclave of 1549-50 that elected Pope Julius III. The new pope made Cardinal Cornaro papal legate in Viterbo and the "Patrimonium Sancti Petri". On June 27, 1550, he opted for the deaconry of Santa Maria in Domnica.