|Covid-19|January 7 – Philip the Good, Duke of Burgundy, marries Isabella of Portugal.
January 10 – Philip the Good founds the Order of the Golden Fleece.
March 29 – The Ottoman Empire under Murad II captures Thessalonica.
May 14 – The French first attempt to relieve the Siege of Compiègne.
May 23 – Joan of Arc is captured by the Burgundians while leading an army to relieve Compiègne.
June 14 – William Waynflete becomes vicar of Skendleby, Lincolnshire.
July 11 – The Battle of Trnava, Hussite victory on the Hungarian-Moravian-Serbian army.
October 27 – Švitrigaila succeeds his cousin as ruler of Lithuania.
Bratislava Castle is converted to a fortress under Sigismund of Luxemburg.
Optical methods are first used in the creation of art.
With the surrender of Chalandritsa and the citadel of Patras to the Byzantine Despotate of the Morea, the Principality of Achaea comes to an end.
March 10 – Oliviero Carafa, Catholic cardinal (d. 1511)
March 23 – Margaret of Anjou, queen of Henry VI of England (d. 1482)
June 13 – Beatrice, Duchess of Viseu, Portuguese infante (d. 1506)
June 27 – Henry Holland, 3rd Duke of Exeter, Lancastrian leader during the English Wars of the Roses (d. 1475)
King James II of Scotland (d. 1460)
Alexander Stewart, Duke of Rothesay (d. 1430)
October 28 – Richard West, 7th Baron De La Warr, son of Reginald West (d. 1475)
November 11 – Jošt of Rožmberk, Bishop of Breslau, Grand Prior of the Order of St. John (d. 1467)
date unknown – Hosokawa Katsumoto, Japanese warlord
Barbara von Ottenheim, German alleged witch and sculpture model (d. 1484)
probable – Heinrich Kramer, German churchman and inquisitor (d. 1505)
January 29 or 1427 – Andrei Rublev, Russian iconographer (possible date; b. 1360)
August 4 – Philip I, Duke of Brabant (b. 1404)
August 18 – Thomas de Ros, 8th Baron de Ros, English soldier and politician (b. 1406)
October 27 – Vytautas, Grand Prince of Lithuania (b. 1352)
Thomas FitzAlan, English nobleman
Christine de Pizan, proto-feminist writer
Year 1430 (MCDXXX) was a common year starting on Sunday (link will display the full calendar) of the Julian calendar.