February 7 – Luchuan–Pingmian campaigns: In Ming dynasty China, the Vice Minister of Justice, He Wenyuan, petitions the Imperial Court not to make a second punitive campaign against the kingdom of Möng Mao and its ruler, Si Renfa, arguing that the nation's resources should not be wasted on worthless land. The Minister of War, Wang Ji, joins with General Mu Ang in arguing that Si Renfa should be stopped before he conquers more territory. The Emperor authorizes the second campaign.
April 20 — The Council of Florence, led by Pope Eugene IV, declares that the members of the Council of Basel are heretics and votes to excommunicate them, as well as affirming the superiority of the Pope over the Councils in the bull Etsi non dubitemus. In 1440, the Council of Basel had declared Eugene IV to be a heretic, deposed him as Pope, and excommunicated him.
May 3 – In Denmark, a rebel army of 25,000 peasants led by Henrik Reventlow repels an attack by Swedish nobles, led by Eske Jensen Brock. The peasants prepare a trap near their camp at St. Jørgensbjerg before the Battle of St. Jorgen's Hill, placing trees and soil over a swamp, and Brock's army of knights becomes mired down, where almost all (including Brock) are slaughtered.
May 8 – The Siege of Creil is Started on orders of King Charles VII of France against the English held town and council. William Peyto surrenders on May 25.
June 27 – The siege of Novo Brdo in Serbia ends after eight months as Ottoman Empire troops, led by the Sultan Murad II and General Hadım Şehabeddin guarantee the safe evacuation of the surviving Ragusan defenders, accept the Serbian surrender.
July–September
July 12 ((Kakitsu 1, 24th day of the 6th month) – In Japan, the ShōgunAshikaga Yoshinori is murdered by Akamatsu Mitsusuke, who is upset that Ashikaga has made Akamatsu Sadaura leader of the Akamatsu clan. Over the next 16 days, several prominent nobles allied with Ashikaga are killed during the fighting including Kyōgoku Takakazu, the Shugo of Yamashiro Province and Ōuchi Mochiyo (1394–1441), the head of the Ōuchi clan. After the fighting ceases, Yoshinori's 8-year-old son, Ashikaga Yoshikatsu, is proclaimed as the new shōgun.
August 26 – Bishop Alberto da Sarteano, who had been sent by the Vatican on a mission to seek the Ethiopian Coptic Christian Church to join with the Roman Catholic Church, returns to Rome with four Ethiopians who had been allowed to leave by the EmperorZara Yaqob. Two of the visitors the attend the Council of Florence to discuss the possible union of Coptic Orthodoxy and the Latin Church, marking the earliest recorded contact of the Ethiopian Coptic Church with Europe.
September 15 – The Metropolitan Isidore of Kiev is allowed by Grand Prince Vasily II to escape from imprisonment in Moscow, along with two of his disciples, Gregory the Bulgarian and Afanasy. He flees to Tver and then to Novogrudok and eventually to Rome.
September 19 – The siege of Pontoise ends after four months, following a three-day final assault led by Marshal André de Laval-Montmorency and Jean de Bueil, Count of Sancerre of the French Army. More than 400 of the English defenders are killed, and hundreds of survivors taken prisoner, including their commander, Baron Clinton. Because Pontoise was not surrendered, the property of the survivors is seized by the French and Clinton and most of his officers are held hostage until a ransom is paid. The English soldiers are not ransomed and are drowned in public instead.
October 25 – In accordance with the proposals for the Peace of Cremona to end the war between Venice and Milan, Francesco I Sforza of Venice marries Bianca Maria Visconti, daughter of the Duke of Milan. An Italian tradition credits the creation of nougat to the celebration of the wedding.
Nuno Tristão reaches the Ras Nouadhibou (Cabo Branco) on the western coast of Africa. This is probably the first voyage where a caravel is used for maritime exploration.
12Liew, Foon Ming (1996). "The Luchuan-Pingmian Campaigns (1436–1449) in the Light of Official Chinese Historiography". Oriens Extremus. 39 (2): 176. JSTOR24047471.
↑'The colleges and halls: King's', in A History of the County of Cambridge and the Isle of Ely: Volume 3, the City and University of Cambridge, ed. J P C Roach (London, 1959), pp. 376-408. British History Online http://www.british-history.ac.uk/vch/cambs/vol3/pp376-408 [accessed 5 February 2021]
↑ Jean Charles Léonard Simonde de Sismondi, Italian Republics, Or, the Origin, Progress and Fall of Italian Freedom (A. and W. Galignani, 1841) p.227 ("Venice had acquired by treachery, on the 24th of February, 144, the principality of Ravenna, governed for 166 years by the house of Polenta.")
↑Historical Tables, 58 BC–AD 1985, by S. H. Steinberg · 1986) p.97 ("1441, Sept. 6: Peace of Copenhagen between Hansa and Holland."
↑Ernst Robert Daenell, Die blütezeit der deutschen Hanse (Walter de Gruyter, 1905) p.320 ("Am 6. September 1441 wurde der Vertrag zwischen beiden geschlossen, in dem die Hollander den Presussen und Livlandern als Enstschadigung fur die Wegnahme der 22 Schiffe im Jarhre 1438...")("On 6 September 1441, the treaty was concluded between the two, in which the Dutch offered the Prussians and Livonians compensation for the capture of the 22 ships in 1438...")
123al-Ghāzī, ‘Abd Allāh ibn Muḥammad (2009). ‘Abd al-Malik ibn ‘Abd Allāh ibn Duhaysh (ed.). Ifādat al-anām إفادة الأنام (in Arabic). Vol.3 (1sted.). Makkah: Maktabat al-Asadī. pp.292–293.
↑One or more of the preceding sentences incorporates text from a publication now in the public domain:Herbermann, Charles, ed. (1913). "Ambrosians". Catholic Encyclopedia. New York: Robert Appleton Company.