1420
Year 1420 was a leap year starting on Monday.
| Gregorian calendar | 1420 MCDXX | 
| Ab urbe condita | 2173 | 
| Armenian calendar | 869 ԹՎ ՊԿԹ | 
| Assyrian calendar | 6170 | 
| Balinese saka calendar | 1341–1342 | 
| Bengali calendar | 827 | 
| Berber calendar | 2370 | 
| English Regnal year | 7 Hen. 5 – 8 Hen. 5 | 
| Buddhist calendar | 1964 | 
| Burmese calendar | 782 | 
| Byzantine calendar | 6928–6929 | 
| Chinese calendar | 己亥年 (Earth Pig) 4116 or 4056 — to — 庚子年 (Metal Rat) 4117 or 4057 | 
| Coptic calendar | 1136–1137 | 
| Discordian calendar | 2586 | 
| Ethiopian calendar | 1412–1413 | 
| Hebrew calendar | 5180–5181 | 
| Hindu calendars | |
| - Vikram Samvat | 1476–1477 | 
| - Shaka Samvat | 1341–1342 | 
| - Kali Yuga | 4520–4521 | 
| Holocene calendar | 11420 | 
| Igbo calendar | 420–421 | 
| Iranian calendar | 798–799 | 
| Islamic calendar | 822–823 | 
| Japanese calendar | Ōei 27 (応永27年) | 
| Javanese calendar | 1334–1335 | 
| Julian calendar | 1420 MCDXX | 
| Korean calendar | 3753 | 
| Minguo calendar | 492 before ROC 民前492年 | 
| Nanakshahi calendar | −48 | 
| Thai solar calendar | 1962–1963 | 
| Tibetan calendar | 阴土猪年 (female Earth-Pig) 1546 or 1165 or 393 — to — 阳金鼠年 (male Iron-Rat) 1547 or 1166 or 394 | 
| Millennium: | 2nd millennium | 
|---|---|
| Centuries: | 14th century – 15th century – 16th century | 
| Decades: | 1390s 1400s 1410s – 1420s – 1430s 1440s 1450s | 
| Years: | 1417 1418 1419 – 1420 – 1421 1422 1423 | 
Events
    
- May 21 – Treaty of Troyes. With the Burgundian faction dominant in France, King Charles VI of France acknowledges Henry V of England as his heir and as virtual ruler of most of France.
- May 25 – Henry the Navigator is appointed governor of the Order of Christ.
- The Madeira Islands were discovered by the Portuguese João Gonçalves Zarco.
- Hussite Wars – Sigismund, Holy Roman Emperor fails at the battle of Vysehrad and is ejected from Bohemia.
- Catherine of Valois marries Henry V of England.
- Henry V of England starts the construction Grace Dieu (ship)
- Construction begins on the Temple of Heaven in Beijing, China while the Forbidden City is completed.
- World population reaches 3.75 million.
Births
    
- November 24 – John Stafford, 1st Earl of Wiltshire, English politician (died 1473)
- date unknown
- Jean Fouquet, French painter (died 1481)
- Nicolas Jenson, French engraver (died 1480)
 
Deaths
    
- June 11 – John III, Burgrave of Nuremberg (born c.1369)
- August 9 – Pierre d'Ailly, French theologian and cardinal (born 1351)
- September 3 – Robert Stewart, 1st Duke of Albany, regent of Scotland
- date unknown
- Epiphanius the Wise, Russian saint
- Andrew of Wyntoun, Scottish chronicler (born 1350)
 
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