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|1420 by topic|
|Arts and science|
|Architecture - Art|
|Political entities - State leaders - Colonial governors - Religious leaders|
|Birth and death categories|
|Births - Deaths|
|Establishments and disestablishments categories|
|Establishments - Disestablishments|
|Art and literature|
|1420 in poetry|
|Ab urbe condita||2173|
|Balinese saka calendar||1341–1342|
|English Regnal year||7 Hen. 5 – 8 Hen. 5|
|Chinese calendar||己亥年 (Earth Pig)
4116 or 4056
— to —
庚子年 (Metal Rat)
4117 or 4057
|- Vikram Samvat||1476–1477|
|- Shaka Samvat||1341–1342|
|- Kali Yuga||4520–4521|
|Japanese calendar||Ōei 27
|Minguo calendar||492 before ROC
|Thai solar calendar||1962–1963|
1546 or 1165 or 393
— to —
1547 or 1166 or 394
|Wikimedia Commons has media related to 1420.|
- March – The Çelebi Sultan Mehmed Mosque in Didymoteicho is inaugurated.
- 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.
- June 2 – Catherine of Valois marries King Henry V of England.
- June 7 – Troops of the Republic of Venice capture Udine after a long siege, ending the independence of the Patriarchal State of Friuli, run by the Patriarch of Aquileia.
- October 22 – Ghiyāth al-dīn Naqqāsh, an envoy of the embassy sent by the Timurid ruler of Persia, Mirza Shahrukh (r. 1404–1447), to the Ming Dynasty of China during the reign of the Yongle Emperor (r. 1402–1424), records his sight and travel over a large floating pontoon bridge at Lanzhou (constructed earlier in 1372) as he crosses the Yellow River on this day. He writes that it was: "...composed of twenty three boats, of great excellence and strength attached together by a long chain of iron as thick as a man's thigh, and this was moored on each side to an iron post as thick as a man's waist extending a distance of ten cubits on the land and planted firmly in the ground, the boats being fastened to this chain by means of big hooks. There were placed big wooden planks over the boats so firmly and evenly that all the animals were made to pass over it without difficulty."
- October 28 – Beijing is officially designated the capital of the Ming Dynasty, during the same year that the Forbidden City, the seat of government, is completed.
- November 1 – Hussite Wars – Battle of Vyšehrad: Sigismund, Holy Roman Emperor, fails and is ejected from Bohemia.
- Henry V of England commences construction of the ship Grace Dieu.
- Tang Saier starts a rebellion against the emperor of China, and takes two cities with her rebel army, before she is defeated.
- Construction begins on the Temple of Heaven in Beijing, China while the palace complex of the Forbidden City is completed. In this year the Yongle Emperor confers the title "Beijing" ("Northern Capital") for the Ming Dynasty's new capital city, replacing Nanjing.
- Construction of the dome of Florence Cathedral is started, after Filippo Brunelleschi wins the commission for his "double shell" design.
- Radu II Praznaglava, supported by the Ottomans, and Dan II, with Hungarian help, start a 7 years long struggle for the throne of Wallachia, after Mihail I is killed in a battle. The throne of Wallachia will switch from one to another about 4 times until 1427, when Radu II dies.
- Alexandru cel Bun defends Moldavia against the first incursion by the Ottomans, at Cetatea Albă.
- February 9 – Dorothea of Brandenburg, Duchess of Mecklenburg (d. 1491)
- April 23 – George of Poděbrady, King of Bohemia (d. 1471)
- June 5 – Anna of Saxony, Landgravine of Hesse, German royalty (d. 1462)
- July 19 – William VIII, Marquess of Montferrat (d. 1483)
- October 1 – Elisabeth of Cleves, Countess of Schwarzburg-Blankenburg, German noble (d. 1488)
- date unknown
- June 11 – John III, Burgrave of Nuremberg (b. c. 1369)
- August 9 – Pierre d'Ailly, French theologian and cardinal (b. 1351)
- September 3 – Robert Stewart, Duke of Albany, regent of Scotland
- date unknown
- Lily Xiao Hong Lee, Sue Wiles: Biographical Dictionary of Chinese Women, Volume II: Tang Through Ming 618 - 1644