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|Ab urbe condita||2180|
|Balinese saka calendar||1348–1349|
|English Regnal year||5 Hen. 6 – 6 Hen. 6|
|Chinese calendar||丙午年 (Fire Horse)|
4123 or 4063
— to —
丁未年 (Fire Goat)
4124 or 4064
|- Vikram Samvat||1483–1484|
|- Shaka Samvat||1348–1349|
|- Kali Yuga||4527–4528|
|Japanese calendar||Ōei 34|
|Minguo calendar||485 before ROC|
|Thai solar calendar||1969–1970|
1553 or 1172 or 400
— to —
1554 or 1173 or 401
|Wikimedia Commons has media related to 1427.|
- 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.
- 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.
- 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)
- 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
- The History of the Feuds and Conflicts Among the Clans in the Northern Parts of Scotland and in the Western Isles: from the year M.XX1 unto M.B.C.XIX, now first published from a manuscript wrote in the reign of King James VI. Foulis press, 1764.
- "Chimalpopoca, "Escudo humeante (1417-1426)" [Chimalpopoca, “Smoking Shield" (1417-1426)]. Arqueologia Mexico (in Spanish).