Amédée VIII de Savoie
In 1438, the Council of Basel was moved to Ferrara, and, in doing so, split into two factions, one remaining at Basel and electing their own pope, the Antipope Felix V. The faction that settled at Ferrara had to leave soon, however, due to an appearance of the plague. They were reconstituted at Florence by Pope Eugenius IV, and became the Council of Florence, which was transferred to Rome in 1443.