[1] In 1462, he served as papal legate to the Holy Roman Empire, accompanied by jurist Francisco de Toledo, to solve the situation in the Archbishopric of Mainz, where Archbishop Diether von Isenburg had been deposed by Pope Pius II.
[1] On his way home from Germany, Ferris received news that the new pope, Paul II, had promoted him to the episcopate: he was elected Bishop of Tarazona on October 1, 1464 and occupied that see until his death.
[1] Paul II also named him Referendary intimus et carissimus, in which capacity he handled some of the most delicate matters at the papal court over the next twelve years.
[1] On June 24, 1478, with the papal court absent from Rome because of an outbreak of bubonic plague, he became temporary Camerlengo of the Sacred College of Cardinals.
[1] He is buried in Santa Maria sopra Minerva, with a tomb sculpted by Mino da Fiesole.