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This article is about the year 1421. For the book by Gavin Menzies, see 1421: The Year China Discovered the World.
|Centuries:||14th century – 15th century – 16th century|
|Decades:||1390s 1400s 1410s – 1420s – 1430s 1440s 1450s|
|Years:||1418 1419 1420 – 1421 – 1422 1423 1424|
|1421 by topic|
|Arts and science|
|Architecture - Art|
|State leaders - Sovereign states|
|Birth and death categories|
|Births - Deaths|
|Establishments and disestablishments categories|
|Establishments - Disestablishments|
|Art and literature|
|1421 in poetry|
|Ab urbe condita||2174|
|English Regnal year||8 Hen. 5 – 9 Hen. 5|
|Chinese calendar||庚子年 (Metal Rat)
4117 or 4057
— to —
辛丑年 (Metal Ox)
4118 or 4058
|- Vikram Samvat||1477–1478|
|- Shaka Samvat||1343–1344|
|- Kali Yuga||4522–4523|
|Japanese calendar||Ōei 28
|Minguo calendar||491 before ROC
|Thai solar calendar||1963–1964|
|Wikimedia Commons has media related to 1421.|
- February 2 – Yongle Emperor, the third emperor of Ming Dynasty shifted the Ming capital from Nanjing to Beijing.
- March 21 – Battle of Baugé: A small French force surprises and defeats a smaller English force under Thomas, Duke of Clarence, a brother of Henry V of England, in Normandy.
- May 26 – Mehmed I, Sultan of the Ottoman Empire, dies and is succeeded by his son Murad II.
- November 17–November 19 – The coastal area near Dordrecht in the Netherlands is flooded due to the extremely high tide of the North Sea; 72 villages are drowned, killing about 10,000 people.
- John III of Dampierre, Marquis of Namur, sells his estates to Philip the Good, Duke of Burgundy.
- The first patent is issued by the Republic of Florence.
- Portuguese sailors sent by Henry the Navigator cross the Cape Non, going as far as the Cape Bojador.
- Traditional date – Foundation of Larabanga Mosque in modern-day northern Ghana.
- The Ming dynasty possibly discovered the Americas, according to historian Gavin Menzies in his book 1421: The Year China Discovered America, although this claim is largely disputed.
- March 9 – Francesco Sassetti, Italian banker (d. 1490)
- May 29 – Charles, Prince of Viana (d. 1461)
- June 3 – Giovanni di Cosimo de' Medici, Italian noble (d. 1463)
- July 25 – Henry Percy, 3rd Earl of Northumberland, English politician (d. 1461)
- August 1 – Thomas Dutton, medieval English knight (d. 1459)
- October 10 – John Paston, English politician (d. 1466)
- December 6 – King Henry VI of England (d. 1471)
- date unknown
- January 21 – Niccolò I Trinci, lord of Foligno (assassinated)
- March 22 – Thomas of Lancaster, 1st Duke of Clarence, second son of Henry IV of England (killed in battle) (born 1388)
- April 21 – John FitzAlan, 13th Earl of Arundel (born 1385)
- May – Balša III, ruler of Zeta
- May 26 – Mehmed I, Ottoman Sultan (b. 1389)
- Terence, Kealey (1996), The Economic Laws of Scientific Research