1427

Year 1427 (MCDXXVII) was a common year starting on Wednesday (link will display the full calendar) of the Julian calendar.

January–December

 * January – Spring – Radu II of Wallachia resumes the throne for the fourth time, but a seven-year struggle for it ends when he is defeated in battle, and probably killed, by Dan II, who resumes the throne for a fifth term.
 * April – The House of Balsic's rule of Montenegro comes to an end with the death of Balša III.
 * 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 citizens of Paris.
 * October 13 – Lincoln College, a constituent college of the University of Oxford in England, is founded by the Bishop of Lincoln.

Date unknown

 * 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.
 * The Celestine Order is 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.
 * Battle of the Echinades: A Byzantine fleet defeats the fleet of Carlo I Tocco.
 * Itzcoatl becomes the 4th Tlatoani of Tenochtitlan, after his nephew Chimalpopoca is killed by the Maxtla, at Azcapotzalco.
 * Bhaktapur Royal Palace (in Nepal) is built by King Yaksa Malla.

Births

 * February 27 – Ruprecht, Archbishop of Cologne (d. 1480)
 * May 8 – John Tiptoft, 1st Earl of Worcester, Lord High Treasurer (d. 1470)
 * May 29 – Françoise d'Amboise, duchess consort of Brittany, co-founder of the first monastery of the Carmelites in France (d. 1485)
 * June 22 – Lucrezia Tornabuoni, Italian writer, adviser and spouse of Piero di Cosimo de' Medici (d. 1482)
 * September 9 – Thomas de Ros, 9th Baron de Ros, English politician (d. 1464)
 * October 26 – Archduke Sigismund of Austria (d. 1496)
 * November 24 – John Stafford, 1st Earl of Wiltshire (d. 1473)
 * 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
 * May 28 – Henry IV, Count of Holstein-Rendsburg (b. 1397)
 * July 19 – Stefan Lazarević, Despot of Serbia (b. 1377)
 * date unknown
 * Chimalpopoca, Aztec Tlatoani (ruler) of Tenochtitlán (b. 1397)
 * Qu You, Chinese novelist (b. 1341)
 * probable
 * Jehuda Cresques, Catalan cartographer (b. 1350)
 * Gentile da Fabriano, Italian painter
 * Radu II Prasnaglava, ruler of Wallachia, probably killed in or after a lost battle