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The Council of Constance was an ecumenical council considered invalid by the Roman Catholic Church. The council was called by the Emperor Sigismund, a supporter of Antipope John XXIII, the pope recently elected at Pisa. The council was held from November 16, 1414 to April 22, 1418 in Constance. Its main purpose was to end the Papal schism which had resulted from the Avignon Papacy, or as it is sometimes known, the "Babylonian Captivity of the Church." The Council of Constance marked the high point of the Conciliar movement to reform the Church.