Events of 1433

• Winter: Much of the English town of Alnwick in Northumbria is burnt by a Scottish raiding party.
• The Ming Dynasty in China disbands their naval fleet after the last great maritime expedition led by Admiral Zheng He, altering the balance of power in the Indian Ocean and making it easier for Portugal and other Western naval powers to gain dominance over the seas.
• In Ming Dynasty China, cotton is listed as a permanent item of trade on the tax registers of Songjiang prefecture.
• September: Cosimo de' Medici, later the de facto ruler of Florence and patron of Marsilio Ficino, is exiled by the Albizzi/Strozzi faction.

(Cosimo returned a year later, to the day, in 1434).

Births

• June 23 - Francis II, Duke of Brittany (d. 1488)
• October 19 - Marsilio Ficino, Italian philosopher (d. 1499)
• November 10 - Charles, Duke of Burgundy (d. 1477)
• date unknown
• Francesco Colonna, Italian Dominican priest and monk (d. 1527)
• László Hunyadi, Hungarian statesman and warrior (d. 1457)
• Kettil Karlsson, regent of Sweden

Deaths

• April 14 - Saint Lidwina (b. 1380)
• August 14 - King John I of Portugal (b. 1357)
• August 17 - Jan z Tarnowa, Polish nobleman (b. 1367)
• December 1 - Emperor Go-Komatsu of Japan (b. 1377)
• date unknown - Zheng He, Chinese explorer (b. 1371)