Western Schism
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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.
Antipope John XXIII
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Baldassarre Cossa was Pisan antipope as John XXIII during the Western Schism. The Catholic Church today regards him as an antipope in opposition to Pope Gregory XII, whom it recognizes as the rightful
Miniature from the Chronicle of the Council of Constance by Ulrich of Richenthal
Tomb of Antipope John XXIII