1404

• January 14 – The fourth Parliament of King Henry IV of England opens for a session of two months.
• February 10 – Thomas of Lancaster, the second son of King Henry IV of England, becomes Admiral of the North and South succeeding Admiral Thomas Beaufort.Paul de Rapin-Thoyras, The History of England, Volume 5, (J. and P. Knapton, 1747) p.271
• February 27 – King Guadarfia of the Canary Islands surrenders to the French explorer Jean de Béthencourt, who declares himself to be the new king, but subservient to the sponsor of the expedition, King Enrique III of Castile (part of modern-day Spain)Léon Guérin, Histoire maritime de France contenant (Paris: Dufour et Mulat, 1851) p. 341
• March 1 – Under the Emperor Cheng Zu, China continues to build its fleet, ordering the construction of 50 new seagoing ships from the Capital Guards in Nanjing.{{citation |last=Dreyer |first=Edward L. |year=2007 |title=Zheng He: China and the Oceans in the Early Ming Dynasty, 1405-1433 |publisher=Pearson Longman |location=New York |page=105 |isbn=978-0-321-08443-9 |oclc=64592164}}
• March 20 – As the English Parliament adjourns, King Henry IV gives royal assent to acts that have passed, including the Multipliers Act, which declares "It shall be felony to use the craft of multiplication of gold or silver.", prohibiting any alchemists who has actually may have discovered how to perform transmutation of other substances into precious metals. The law remains in force until repealed 284 years later.

• April 12 – Centurione II Zaccaria buys the Principality of Achaea, located on the Peloponnese peninsula in modern-day Greece, from King Ladislaus of Naples.{{Cite book |last=Dourou-Iliopoulou |first=Maria |title=Angevins and Aragonese in the Mediterranean |publisher=Herodotus |year=2019 |isbn=978-960-485-325-0 |location=Athens |pages=167}}
• April 25 – The War of Padua begins in the Veneto region of northeastern Italy as the army of the Republic of Venice, led by General Malatesta dei Sonetti, leads an attack on Padua, led by the Lord Francesco Novello da Carrara. The city of Vicenza surrenders to the Venetian troops on the same day, while the war against Padua last 19 months.{{cite book |last=Mallett |first=Michael E. |chapter=La conquista della Terraferma| pages=181–240 |chapter-url=https://www.treccani.it/enciclopedia/il-rinascimento-politica-e-cultura-tra-pace-e-guerra-le-forme-del-potere-la-conquista-della-terraferma_(Storia-di-Venezia) |title=Storia di Venezia dalle origini alla caduta della Serenissima. Vol. IV, Il rinascimento: politica e cultura (History of Venice from its origins to the fall of the Serenissima. Vol. IV, The Renaissance: Politics and Culture) |publisher=Istituto della Enciclopedia Italiana |location=Rome |year=1996 |language=Italian |oclc=644711024 }}
• April 27 – At Dijon, in France's Burgundian State, John the Fearless (Jean sans Peur), nephew of Charles VI of France, becomes the new Duke of Burgundy upon the death of his father, Philip the Bold.{{cite encyclopedia |title=John, Duke of Burgundy|encyclopedia=Encyclopædia Britannica |volume=15|last=Poupardin |first=René |author-link=René Poupardin |publisher=Cambridge University Press |date=2011| pages=445–446}}
• April or May – Battle of Blackpool Sands: Local English forces defeat an attempted raid from Saint-Malo on the port of Dartmouth, Devon; the French commander, William du Chastel, is killed.{{cite book|title=Defending the Island|last=Longmate|first=Norman|author-link=Norman Longmate|year=1990|publisher=Grafton|location=London|isbn=0-586-20845-3}}{{cite book|title=The Fears of Henry IV|last=Mortimer|first=Ian|author-link=Ian Mortimer (historian)|year=2007|publisher=Jonathan Cape|location=London|isbn=978-0-224-07300-4}}
• May 22 – The Peace of Raciążek treaty is signed by the representatives of King Władysław II Jagiełło of Poland, by the Grand Duke Vytautas of Lithuania, and by the Teutonic Knights.
• June 14 – Welsh rebel leader Owain Glyndŵr enters an alliance with the French against the English. He has begun to hold parliamentary assemblies (first on May 10 at Dolgellau).{{cite book|last1=Palmer|first1=Alan|last2=Palmer|first2=Veronica|year=1992|title=The Chronology of British History|publisher=Century Ltd|location=London|pages=115–117|isbn=0-7126-5616-2}}
• June 21 – The formal coronation of Owain Glyndŵr as Prince of Wales takes place at Harlech.Terry Breverton, Owain Glyndwr: The Story of the Last Prince of Wales (Amberley Publishing, 2009)

=== July–September ===

• July 27 – In Southern India, Bukka Raya II becomes the new ruler of the Vijayanagara Empire in what are the modern-day Indian states of Karnataka, Andhra Pradesh, Tamil Nadu and Kerala.{{Cite journal |url= https://www.jstor.org/stable/44145214|last=Lakshmi|first=Kumari Jhansi|date=1958|title=The Chronology of the Sangama Dynasty|journal=Proceedings of the Indian History Congress |volume=21 |pages=290–297 |jstor=44145214 }}
• September 14 – Albert IV, Duke of Austria, dies at the age of 26 from an illness contracted while he was fighting against Bohemia and Moravia for control of the city of Znaim (modern Znojmo in the Czech Republic).{{cite book |first=C.W. |last=Previte-Orton |title=The Shorter Cambridge Medieval History: The Twelfth Century to the Renaissance |volume=2 |publisher=Cambridge University Press |year=1952 }} He is succeeded as Duke by his 6-year old son, Albert.

• October 16 – The 5th Parliament of King Henry IV of England (summoned August 25), nicknamed "The Unlearned Parliament" because Henry refuses to allow lawyers to sit, opens for a four week session in Coventry, closing on November 13.
• October 17 – Cosimo de' Migliorati, Cardinal of the Basilica Cross in Jerusalem, is elected unanimously by eight cardinals to succeed the late Pope Boniface IX. Migliorati takes the papal name Innocent VII as the 204th pope of the Roman Catholic Church."[http://www.newadvent.org/cathen/08019a.htm Pope Innocent VII], by Michael Ott, in The Catholic Encyclopedia, Vol. 8 (New York: Robert Appleton Company, 1910), retrieved December 19, 2018
• November 19 – The St. Elizabeth's flood of the North Sea devastates parts of Flanders, Zeeland and Holland.
• December 16 – Willem VI becomes the new Count of Holland upon the death of his father, Albrecht I, Duke of Lower Bavaria.{{cite book |title=Magnanimous Dukes and Rising States: The Unification of the Burgundian Netherlands, 1380-1480 |first=Robert |last=Stein |publisher=Oxford University Press |year=2017 |page=37}}

• Jean de Béthencourt becomes the first ruler of the Kingdom of the Canary Islands.
• Stephan Tvrtko II succeeds Stefan Ostoja as King of Bosnia.
• Peace is declared between Lithuania and the Teutonic Knights, after they agree to exchange land and form an alliance against Muscovy.
• A civil war, lasting two years, breaks out in the Majapahit Empire in modern-day Indonesia.
• Wallachia reaches its maximum extent under Mircea cel Bătrân.
• The University of Turin is founded.
• Timur is hit by a fever, while preparing to invade China.
• Virupaksha Raya succeeds Harihara Raya II, as ruler of the Vijayanagara Empire in modern-day southern India.
• Narayana Ramadhipati succeeds Ponthea Yat as King of Cambodia.
• Ruaidri Caech MacDermot succeeds Conchobair Óg MacDermot as King of Magh Luirg, in what later becomes northeast Connacht, Ireland.

• January 18 – Sir Philip Courtenay, British noble (d. 1463)
• February 14 – Leon Battista Alberti, Italian painter, poet, and philosopher (d. 1472)
• March 25 (bapt.) – John Beaufort, 1st Duke of Somerset, English military leader (d. 1444)
• June – Murad II, Ottoman Sultan (d. 1451)
• July 6 – Yamana Sōzen, Japanese warlord and monk (d. 1473)
• July 25 – Philip I, Duke of Brabant (d. 1430)
• September 30 – Anne of Burgundy (d. 1432)
• October 14 – Marie of Anjou, queen of Charles VII of France (d. 1463)

• April 27 – Philip II, Duke of Burgundy (b. 1342)
• September 14 – Albert IV, Duke of Austria (b. 1377)
• September 27 – William of Wykeham, English bishop and statesman (b. 1320)
• October 1 – Pope Boniface IX (b. 1356)
• October 15 – Marie Valois, French princess (b. 1344)
• December 13 – Albert I, Duke of Bavaria (b. 1336)
• date unknown – Eleanor of Arborea, ruler of Sardinia (b. 1350)

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