Pope Gregory XII, born Angelo Corraro, Corario, or Correr, was head of the Catholic Church from 30 November 1406 to 4 July 1415. Reigning during the Western Schism, he was opposed by the Avignon claimant Benedict XIII and the Pisan claimants Alexander V and John XXIII. Gregory XII wanted to unify the Church and voluntarily resigned in 1415 to end the schism.
Portrait of Gregory XII by van Gent and Berruguete (c. 1476, Ducal Palace, Urbino)
The Western Schism, also known as the Papal Schism, the Great Occidental Schism, or the Schism of 1378, was a split within the Catholic Church lasting from 1378 to 1417 in which bishops residing in Rome and Avignon both claimed to be the true pope, and were joined by a third line of Pisan claimants in 1409. The schism was driven by personalities and political allegiances, with the Avignon Papacy being closely associated with the French monarchy.
A 14th-century miniature symbolizing the schism
Habemus Papam at the Council of Constance
Plaque commemorating the popes buried in St. Peter's. Alexanders VI, VII, and VIII are numbered as though the Pisan pope Alexander V were legitimate, but John XXIII (d. 1963) has reused the ordinal of the Pisan pope John XXIII.
