1434

January–December

• April 14 – The foundation stone of Nantes Cathedral in Nantes, France, is laid.
• May 30 – Hussite Wars – Battle of Lipany: The Catholics and Ultraquists defeat the Taborites, ending the Hussite Wars.
• June 19 or 20 – Zara Yaqob becomes Emperor of Ethiopia.
• Late June – Miner Engelbrekt Engelbrektsson begins a Swedish rebellion against King Eric of Pomerania (named the Engelbrekt rebellion after him), eventually leading to the deposition of the king.
• July 10–August 9 – Suero de Quiñones and his companions stage the Passo Honroso, at the Órbigo in León.
• August 16 – King Eric of Pomerania is deposed from the Swedish throne at a meeting in Vadstena. He still retains power in Denmark and Norway, though.
• September – Cosimo de' Medici returns to Florence, one year after being exiled by the Albizzi and Strozzi faction.
• October 21 – The University of Catania is founded in Italy.

Date unknown

• Jan van Eyck paints the Arnolfini Portrait.
• Explorer Gil Eanes rounds Cape Bojador in Western Sahara, thus destroying the legends of the "Dark Sea".
• Portuguese traders deliver their first cargo of African slaves to Lisbon.
• In Ming Dynasty China, a long episode of drought, flood, locust infestation, and famine cripple agriculture and commerce in areas throughout the country, until 1448.
• The Puke Feud occurs in Sweden.

• January 7 – Adolf, Duke of Bavaria (d. 1441)
• March 12 – William III, Count of Henneberg-Schleusingen (d. 1480)
• March 19 – Ashikaga Yoshikatsu, Japanese shōgun (d. 1443)
• March 25 – Eustochia Smeralda Calafato, Italian saint (d. 1485)
• June 13 – Cristoforo della Rovere, Roman Catholic cardinal (d. 1478)
• September 18 – Eleanor of Portugal, Holy Roman Empress (d. 1467)
• September 23 – Yolande of Valois, Duchess consort of Savoy (d. 1478)
• December 28 – Antonio Grimani, Italian admiral (d. 1523)
• probable
  • Isabella of Bourbon, Burgundian countess, spouse of Charles the Bold (d. 1465)
  • Matteo Maria Boiardo, Italian poet (d. 1494)
  • Kano Masanobu, Japanese painter (d. 1530)

• January – John I, Duke of Bourbon (b. 1381)
• April 20 – Alexandra of Lithuania, Duchess of Masovia
• May 30 – Prokop the Great, Hussite general (b. 1380)
• June – Amda Iyasus, Emperor of Ethiopia
• June 1 – King Wladislaus II of Poland (age unknown)
• June 5 – Yuri IV, Russian grand prince (b. 1374)
• November 12 – King Louis III of Anjou (b. 1403)