Editing 1440 (section)

=== July–September ===
* [[July 11]] &ndash; [[John V, Duke of Brittany]], signs a neutrality agreement with the Kingdom of England, promising not to give shelter to England's enemies in the ongoing English occupation of western France.<ref>{{cite book |last= Wagner |date=2006 |first=John A. |title=Encyclopedia of the Hundred Years War |url= http://dl.lilibook.ir/2016/03/Encyclopedia-of-the-Hundred-Years-War.pdf |archive-url= https://web.archive.org/web/20180716235643/http://dl.lilibook.ir/2016/03/Encyclopedia-of-the-Hundred-Years-War.pdf |url-status= dead |archive-date= 2018-07-16 |publisher=Greenwood Press |place=[[Westport, Connecticut|Westport]] |page=183 |isbn=978-0-313-32736-0 }}</ref>
* [[July 17]] &ndash; [[Władysław III of Poland|Wladyslaw III]], King of Poland and Supreme Duke of Lithuania, is crowned as [[List of Hungarian monarchs|King László I of Hungary]] at the [[Basilica of the Assumption of the Blessed Virgin Mary]] in [[Székesfehérvár]].<ref>{{cite book |last=Ágoston |first=Gábor |date=2023 |title=The Last Muslim Conquest. The Ottoman Empire and Its Wars in Europe |url=https://books.google.com/books?id=4zS0EAAAQBAJ |location=Princeton |publisher=University Press |pages=64-65 |isbn=9780691205397}}</ref>
* [[July 24]] &ndash; At [[Basel]] in Switzerland, [[Amadeus VIII, Duke of Savoy]] is crowned as "Pope Felix V" by Roman Catholic cardinals of the [[Council of Florence#Rump Council of Basel|Council of Basel]] who had voted to depose [[Pope Eugene IV]] as leader of the Roman Catholic Church.<ref>[https://hls-dhs-dss.ch/it/articles/012614/2006-04-10/ "Felice V: Amedeo VIII diSavoi"], by Bernard Andenmatten, in ''Dizionario storico della Svizzera'' (2006)</ref> As Felix V, he is  designated in Vatican history as [[Antipope#List of historical antipopes|the last "antipope"]]. He remains in Basel and never travels to Rome to assume the papacy; in 1449, after the death of Eugene IV, Amadeus assumes an oath of loyalty to Eugene's successor, [[Pope Nicholas V]].
* [[August 31]] &ndash; In France, the [[Siege of Tartas]] is commenced in [[Gascony]] by troops of the Kingdom of England and the English-controlled [[Duchy of Gascony]] in an attempt to oust  a French supporter of King Charles VII, [[Charles II d'Albret]], who has taken control of Tartas. The siege lasts for almost two years before being abandoned by the English.<ref>{{citation |url=http://journeedetartas.blogspot.com.br/|title=Charles VII at Tartas|date=30 June 2009|access-date=16 February 2018}}</ref><ref>{{cite journal |last= Piraud |date=2010 |first=Claude-Henri |title=Les armistices de 1441 en Guyenne |journal=Bulletin de la Société historique et archéologique du Périgord |language=fr |volume=137 |pages=34 |issn=1141-135X |url=https://www.academia.edu/13216649 }}</ref>  
* [[September 10]] &ndash; A rebellion in Hungary, instigated by [[Ladislaus Garai]] against the newly elected [[Władysław III of Poland|King Laszlo]] (who is also king of Poland), is ended when Garai's army is annihilated in a battle at [[Bátaszék]] by the troops of General [[John Hunyadi|János Hunyadi]] and of [[Nicholas of Ilok]], [[Ban of Croatia|ruler of Croatia]].<ref>{{cite book |last=Museranu |first=Camil |date=2018 |title=John Hunyadi. Defender of Christendom |url=https://books.google.com/books?id=4BAjEAAAQBAJ |location=Las Vegas |publisher=Histria Books |pages=73-74 |isbn=9781592111152}}</ref>
* [[September 12]] &ndash; [[Eton College]], one of the most famous prepratory boarding schools for boys in England, is founded by [[Henry VI of England|King Henry VI]] as "Kynge's College of Our Ladye of Eton besyde Windesore".
* [[September 13]] &ndash; 
**[[Christopher of Bavaria]], King Christopher III of Denmark, is formally enthroned as [[List of Swedish monarchs|King Kristofer I of Sweden]], bringing an end to the regency of [[Charles VIII of Sweden|Karl Knutsson Bonde]]. 
**Breton knight [[Gilles de Rais]] is arrested at his castle at [[Machecoul]], after an accusation of murdering children is brought against him by the [[Bishop of Nantes]].<ref>{{Citation |language=fr |last=Bataille |first=Georges |author-link=Georges Bataille |title=Procès de Gilles de Rais. Documents précédés d'une introduction de Georges Bataille |location=Paris |publisher=Club français du livre |year=1959 |page=158}}</ref>
* [[September 21]] &ndash; The [[Burgraviate of Nuremberg]], a member nation-state of the [[Holy Roman Empire]], comes to an end after more than three centuries when the two sons of the last Burgrave, [[Frederick V, Burgrave of Nuremberg
|Frederick V]], divide the territory into two separate principalities. [[Frederick II, Elector of Brandenburg|Frederick VI]] (who is also Elector of Brandenburg) becomes the ruler of the [[Principality of Ansbach]], while [[John III, Burgrave of Nuremberg|John III]] becomes the ruler of the [[Principality of Bayreuth]]