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1409 in various calendars
Gregorian calendar	1409; MCDIX
Ab urbe condita	2162
Armenian calendar	858; ԹՎ ՊԾԸ
Assyrian calendar	6159
Balinese saka calendar	1330–1331
Bengali calendar	816
Berber calendar	2359
English Regnal year	10 Hen. 4 – 11 Hen. 4
Buddhist calendar	1953
Burmese calendar	771
Byzantine calendar	6917–6918
Chinese calendar	戊子年 (Earth Rat); 4106 or 3899; — to —; 己丑年 (Earth Ox); 4107 or 3900
Coptic calendar	1125–1126
Discordian calendar	2575
Ethiopian calendar	1401–1402
Hebrew calendar	5169–5170
Hindu calendars
- Vikram Samvat	1465–1466
- Shaka Samvat	1330–1331
- Kali Yuga	4509–4510
Holocene calendar	11409
Igbo calendar	409–410
Iranian calendar	787–788
Islamic calendar	811–812
Japanese calendar	Ōei 16; (応永１６年)
Javanese calendar	1323–1324
Julian calendar	1409; MCDIX
Korean calendar	3742
Minguo calendar	503 before ROC; 民前503年
Nanakshahi calendar	−59
Thai solar calendar	1951–1952
Tibetan calendar	阳土鼠年; (male Earth-Rat); 1535 or 1154 or 382; — to —; 阴土牛年; (female Earth-Ox); 1536 or 1155 or 383

Millennium:	2nd millennium
Centuries:	14th century; 15th century ; 16th century;
Decades:	1380s; 1390s; 1400s ; 1410s; 1420s;
Years:	1406; 1407; 1408; 1409 ; 1410; 1411; 1412;

Year 1409 (MCDIX) was a common year starting on Tuesday (link will display the full calendar) of the Julian calendar.

Events

January 1 – The Welsh surrender Harlech Castle to the English.
January 18 – The Decree of Kutná Hora strengthens the Bohemian Nation at the cost of foreign, mostly German speaking students at the University of Prague. Over a thousand students leave Prague as a consequence, choosing instead the universities of Heidelberg and the new University of Leipzig established later in the year.
March 25 – The Council of Pisa opens. On June 5 it deposes Pope Gregory XII and Antipope Benedict XIII, and on June 26 crowns Petros Philargos as Pope Alexander V; he is subsequently regarded as an antipope.
July – Martin I of Aragon succeeds his own son, as King of Sicily.
August 7 – The Council of Pisa closes.
December 2 – The University of Leipzig opens.
December 9 – Louis II of Anjou founds the University of Aix-en-Provence.

Ulugh Beg becomes governor of Samarkand.
The Republic of Venice purchases the port of Zadar from Hungary.
Grand Master Ulrich von Jungingen of the Teutonic Knights guarantees peace with the Kalmar Union of Scandinavia, by selling the Baltic Sea island of Gotland to Queen Margaret of Denmark, Norway and Sweden.^[1]
Cheng Ho (or Zheng He), admiral of the Ming empire fleet, deposes the king of Sri Lanka.
Mircea cel Bătrân successfully defends Silistra against the Ottomans.

January 16 – René of Anjou, king of Naples (d. 1480)^[2]
March 2 – Jean II, Duke of Alençon, son of John I of Alençon and Marie of Brittany (d. 1476)
March 12 – Isabella of Urgell, Duchess of Coimbra, Portuguese Duchess (d. 1459)
September 13 – Joan of Valois, Duchess of Alençon, French duchess (d. 1432)
October 7 – Elizabeth of Luxembourg (d. 1442)
October 21 – Alessandro Sforza, Italian condottiero (d. 1473)
date unknown – Bernardo Rossellino, Florentine sculptor and architect

May 13 – Jan of Tarnów, Polish nobleman
May 22 – Blanche of England, sister of King Henry V (b. 1392)
July 25 – King Martin I of Sicily (b. 1374)
September 13 – Isabella of Valois, French princess and queen of England (b. 1387)^[3]
date unknown – Thomas Merke, English bishop
probable – Edmund Mortimer, English rebel (b. 1376)

^ Martinsson, Örjan. "Gotland". www.tacitus.nu. Tacitus.nu. Retrieved June 12, 2014.
^ "René I | duke of Anjou". Encyclopedia Britannica. Retrieved May 10, 2019.
^ Panton, James (February 24, 2011). Historical Dictionary of the British Monarchy. Scarecrow Press. p. 266. ISBN 978-0-8108-7497-8.