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, 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, to the day, following his exile by the Albizzi and Strozzi faction.
• October 19 - 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.