Council of Konstanz

The Council of Constance is the 15th century ecumenical council recognized by the Roman Catholic Church, held from 1414 to 1418. The council ended the Western Schism, by deposing or accepting the resignation of the remaining papal claimants and electing Pope Martin V.

The Council also condemned Jan Hus as a heretic and facilitated his execution by the civil authority. It also ruled on issues of national sovereignty, the rights of pagans, and just war in response to a conflict between the Kingdom of Poland and the Order of the Teutonic Knights. The Council is important for its relationship to ecclesial Conciliarism and Papal supremacy.

The council's main purpose was to end the Papal schism which had resulted from the confusion following the Avignon Papacy. Pope Gregory XI's return to Rome in 1377, followed by his death and the controversial election of his successor, Pope Urban VI, resulted in the defection of a number of cardinals and the election of a rival pope based at Avignon in 1378. After thirty years of schism, the rival courts convened the Council of Pisa seeking to resolve the situation by deposing the two claimant popes and electing a new one. The council claimed that in such a situation, a council of bishops had greater authority than just one bishop, even if he were the bishop of Rome. Though the elected Antipope Alexander V and his successor, Antipope John XXIII (not to be confused with the 20th-century Pope John XXIII), gained widespread support, especially at the cost of the Avignon antipope, the schism remained, now involving not two but three claimants: Gregory XII at Rome, Benedict XIII at Avignon, and John XXIII.