On June 5, 1450, he was elected Bishop of Montefeltro. He served as governor of Spoleto from September 1455 to November 1456, and then as governor of Perugia. He became Archbishop of Naples in August 1456, but resigned as archbishop in November 1456.
In the consistory of December 17, 1456, Pope Callixtus III made Tebaldi a cardinal priest. After entering Rome on January 11, 1457, he received the red hat at Santa Maria del Popolo on January 12, 1457. On January 14, 1457, he was awarded the titular church of Sant'Anastasia. In 1458, he served as Camerlengo of the Sacred College of Cardinals.
|Catholic Church titles|
Enea Silvio Piccolomini
|Camerlengo of the Sacred College of Cardinals
Juan de Mella