The Council of Pisa was a controversial council held in 1409. It attempted to end the Western Schism by deposing both Benedict XIII and Gregory XII for schism and manifest heresy. The College of Cardi
The Western Schism, also known as the Great Divide, the Great Occidental Schism, the Schism of 1378, or the Great Western Schism, was a split within the Catholic Church lasting from 20 September 1378
A 14th-century miniature symbolizing the schism
Habemus Papam at the Council of Constance
Plaque commemorating the popes buried in St. Peter's Basilica. Alexanders VI, VII, and VIII are numbered as though the Pisan pope Alexander V were legitimate, but John XXIII (d. 1963) reused the ordinal of the Pisan pope John XXIII.