Council of Pisa

1409 Council of Pisa.
This council was called in order to resolve the Great Schism which occurred in 1378. The council declared Alexander V the new pope to replace Gregory XII, the Roman pope, and Benedict XIII, the Avignon pope. Alexander V was not universally recognized as the pope (resulting in three persons serving as pope for six years) and the Council of Constance was called in 1414 to settle the matter.