Editing Antipope John XXIII (section)

=== Election to the papacy ===
Alexander suddenly died while he was with Cardinal Baldassare Cossa at Bologna on the night of 3–4 May 1410. On 25 May 1410, Cossa was consecrated a pope taking the name John XXIII. He had become an [[priesthood (Catholic Church)|ordained bishop]] only one day earlier. John XXIII was acknowledged as pope by [[Kingdom of France|France]], [[Kingdom of England|England]], [[Kingdom of Bohemia|Bohemia]], [[Kingdom of Portugal|Portugal]], parts of the [[Holy Roman Empire]], and numerous Northern Italian city states, including Florence and [[Republic of Venice|Venice]] and the [[Patriarchate of Aquileia]]; and in the beginning and in 1411–1413 by Hungary and Poland. However, the Avignon Pope Benedict XIII was regarded as pope by the [[Kingdom of Aragon|Kingdoms of Aragon]], [[Kingdom of Castile|Castile]], [[Kingdom of Sicily (Medieval and Early Modern)|Sicily]] and [[Kingdom of Scotland|Scotland]]. [[Gregory XII]] was still favored by [[Ladislaus of Naples]], [[Carlo I Malatesta]], the [[List of rulers of Bavaria|princes of Bavaria]], [[Louis III, Elector Palatine|Louis III]], [[Electorate of the Palatinate|Elector Palatine]], and parts of Germany and [[Kingdom of Poland (1385–1569)|Poland]].<ref>Lightbown, R.W. (1980) ''Donatello & Michelozzo''. London: Harvey Miller. pp. 4–5.</ref> John XXIII made the [[Medici Bank]] the bank of the papacy, contributing considerably to the family's wealth and prestige.<ref name=mediateca>[http://www.palazzo-medici.it/mediateca/en/Scheda_Baldassarre_Cossa "Popes and Prelates", Mediateca di Palazzo Medici]</ref>

The main enemy of John was [[Ladislaus of Naples]], who protected [[Gregory XII]] in Rome. Following his election as pope, John spent a year in Bologna and then joined forces with [[Louis II of Anjou]] to march against Ladislaus. An initial victory proved short-lived and Ladislaus retook Rome in May 1413, forcing John to flee to Florence.<ref name=Kirsch/> In Florence he met [[Sigismund, Holy Roman Emperor|Sigismund]], King of the Romans. Sigismund wanted to end the schism and urged John to call a general council. John did so with hesitation, at first trying to have the council held in Italy (rather than in a German [[Free imperial city|Imperial City]], as Sigismund wanted). The [[Council of Constance]] was convened on 30 October 1414. During the third session, rival [[Pope Gregory XII]] authorized the council as well. The council resolved that all three popes should abdicate and a new pope be elected.<ref name=Miranda>[http://www2.fiu.edu/~mirandas/bios1419.htm Miranda, Salvador. "Cossa, Baldassare", ''The Cardinals of the Holy Roman Church'']</ref>