1434

Year 1434 (MCDXXXIV) was a common year starting on Friday (link will display the full calendar) of the Julian calendar.

January–December

 * April 14 – The foundation stone of Nantes Cathedral in Nantes, Brittany, is laid.
 * May 30 – Hussite Wars – Battle of Lipany: The Catholics and Utraquists 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".
 * 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.

Births

 * 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)

Deaths

 * 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)