Events of 1427

• August 4 - Hussite Wars - Battle of Tachov: The Hussites decisively beat the crusader armies, ending the Fourth Anti-Hussite Crusade.
• August 17 - The first band of Gypsies visits Paris, according to an account of the citizen of Paris.
• Lincoln College, a constituent college of the University of Oxford, is founded.
• The House of Balsic's rule of Montenegro comes to an end.
• Bhaktapur Royal Palace in Nepal is built by King Yaksa Malla.
• Gabriel V is elected Patriarch of the Coptic Church for the second time.
• Minrekyansa becomes King of Ava (ancient Burma).
• The Conflict of Druimnacour occurs in Sutherland, Scotland.
• The first witch hunts begin, in Switzerland.
• Celestine Order established in France.
• The Celebration of Sant Jordi (Saint George) begins in Catalonia (he will later become its patron saint).
• Bremen is expelled from the Hanseatic League.
• Diogo de Silves, Portuguese navigator, discovers seven islands of the Azores archipelago.

Births

• September 9 - Thomas de Ros, 10th Baron de Ros, English politician (d. 1464)
• October 14 - Alesso Baldovinetti, Italian painter (d. 1499)
• October 26 - Archduke Sigismund of Austria (d. 1496)
• November 29 - Zhengtong Emperor of China (d. 1464)
• November 30 - Casimir IV Jagiellon, King of Poland (d. 1492)
• date unknown
• Shen Zhou, Chinese painter (d. 1509)

Deaths

• April 17 - John IV, Duke of Brabant (b. 1403)
• May 7 - Thomas la Warr, 5th Baron De La Warr, English churchman
• August 27 - Reginald West, 6th Baron De La Warr (b. 1395)
• date unknown
• Chimalpopoca, Aztec ruler of Tenochtitlán (b. 1397)
• Qu You, Chinese novelist (b. 1341)
• probable
• Jehuda Cresques, Catalan cartographer (b. 1350)
• Gentile da Fabriano, Italian painter