Council of Constance opens
The Council of Constance, convened by Antipope John XXIII at the urging of Emperor Sigismund, began on November 4, 1414. It aimed to end the Western Schism, which had resulted in three rival claimants to the papacy. The council eventually secured the resignation of John XXIII, deposed or accepted the resignation of the other claimants, and elected Pope Martin V in 1417.