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Events on Thursday 17 May 1410 1
1410Election of Pope John XXIIIPapal Schism deepens as a third line of claimants emergesAfter Pisan antipope Alexander V died in Bologna, the cardinals who had elected him chose Baldassarre Cossa as his successor, who took the name John XXIII. This perpetuated the three-way Papal Schism alongside the rival popes in Rome and Avignon. The schism would not be resolved until the Council of Constance several years later.