Editing 1440 (section)

=== January–March ===
* [[January 6]] &ndash; [[Louis, Duke of Savoy|Ludovico]] becomes the new [[Counts and dukes of Savoy|Duke of Savoy]] upon the abdication of his father [[Amadeus VIII, Duke of Savoy|Amadeus VIII]].<ref>{{cite web |url=http://www.contironco.it/savoia/indice.htm |title= Dinastia Casa Savoia |access-date= July 12, 2006 |archive-url = https://web.archive.org/web/20070418105017/http://www.contironco.it/savoia/indice.htm |archive-date = April 18, 2007}}</ref>
* [[January 8]] &ndash; Seventeen new Roman Catholic Cardinals are added to the College of Cardinals afer having been appointed by Pope Eugene IV on December 18.<ref>{{cite web|authorlink=Salvador Miranda (historian) |last=Miranda |first=Salvador |title=Consistories for the creation of Cardinals 12th Century (1099-1198): Eugenius IV (1431-1447) |url=https://cardinals.fiu.edu/consistories-xv.htm#EugeniusIV|work=The Cardinals of the Holy Roman Church |accessdate=|publisher=[[Florida International University]]|oclc=53276621}}</ref>
* [[February 21]] &ndash; The [[Prussian Confederation]] is proposed as an opposition to the [[Teutonic Knights]] at a meeting in [[Elblag|Elbing]] by nobles from the cities of [[Chełmno|Culm]], Elbing, [[Toruń|Thorn]], [[Gdańsk|Danzig]], [[Braniewo|Braunsberg]], [[Kaliningrad|Königsberg]], and [[Knipawa|Kneiphof]], all of which will become part of Poland a little more than 500 years later. The delegates agree to hold a larger meeting on March 14 at [[Kwidzyn|Marienwerder]].<ref>{{Cite book|last=Górski|first=Karol|title=Związek Pruski i poddanie się Prus Polsce: zbiór tekstów źródłowych|year=1949|publisher=Instytut Zachodni|location=[[Poznań]]|page=xxxi |language=pl}}</ref>
* [[February 22]] &ndash; Four months after the death of [[Albert II of Germany|King Albert of Hungary]], his son, [[Ladislaus the Posthumous]], is born at [[Komárom]] (now Komárno in Slovakia) to Albert's widow, [[Elizabeth of Luxembourg|Elisabeth]], regent for the vacant throne. Elizabeth argues to the Hungarian nobles that Ladislaus should be elected as the rightful successor to King Albert, and that she should serve as the boy's regent.<ref>{{cite book |last=Pálosfalvi |first=Tamás |editor-last=Kristó |editor-first=Gyula |title=Magyarország vegyes házi királyai ''[The Kings of Various Dynasties of Hungary]'' |publisher=Szukits Könyvkiadó |year=2002 |pages=139–140 |chapter=V. László |isbn=963-9441-58-9 |language=hu}}</ref>
* [[February 26]] &ndash; Ibrahim II becomes the [[Candar dynasty|Bey of Candar]], a monarchy on the [[Black Sea]] that now encompasses 10 Turkish provinces, upon the death of his father, Mubariz al-Din Isfendiyar, at the capital, [[Sinop, Turkey|Sinop]].<ref>{{cite journal |last1=Yücel |first1=M. Yaşar |title=Candar-oğlu Çelebi İsfendiyar Bey 1392-1439 |journal=Ankara University History Research Journal |date=1 May 1964 |volume=2 |issue=2 |pages=157-174 |doi=10.1501/Tarar_0000000282 |language=tr|doi-access=free }}</ref>
* [[February]] The [[Praguerie]], an uprising by the French nobility rises up against King [[Charles VII of France|Charles VII]], begins in France and lasts until June.
* [[March 8]] &ndash; Despite the birth of a posthumous son of the late King Albert V, the Hungarian nobles vote to elect King Vladislaus III of Poland as the new King of Hungary.<ref>{{cite book |last1=Solymosi |first1=László |last2=Körmendi |first2=Adrienne |editor-last=Solymosi |editor-first=László | title=Magyarország történeti kronológiája, I: a kezdetektől 1526-ig ''[Historical Chronology of Hungary, Volume I: From the Beginning to 1526]'' |publisher=Akadémiai Kiadó |year=1981 |pages=257 |chapter=A középkori magyar állam virágzása és bukása, 1301–1526 [The Heyday and Fall of the Medieval Hungarian State, 1301–1526] |isbn=963-05-2661-1|language=hu}}</ref>
* [[March 14]] &ndash; The [[Prussian Confederation]] is formed by 53 nobles and clergy, representing 19 Prussian cities, who meet at [[Elblag]] to form an opposition to the [[Teutonic Knights]].
* [[March 20]] &ndash; [[Sigismund Kęstutaitis]], the [[List of Lithuanian monarchs#Grand Duke|Grand Duke of Lithuania]], is assassinated at his residence at the [[Trakai Peninsula Castle]] by supporters of his rival, Svitraglia.<ref>{{cite encyclopedia |first=Bronius |last=Dundulis |editor-first=Vytautas |editor-last=Spečiūnas |encyclopedia=Lietuvos valdovai (XIII–XVIII a.): enciklopedinis žinynas |title=Žygimantas I Kęstutaitis |year=2004 |publisher=Mokslo ir enciklopedijų leidybos institutas |location=Vilnius |isbn=5-420-01535-8 |pages=94–96 |language=lt}}</ref>