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1377 in various calendars
Gregorian calendar	1377; MCCCLXXVII
Ab urbe condita	2130
Armenian calendar	826; ԹՎ ՊԻԶ
Assyrian calendar	6127
Balinese saka calendar	1298–1299
Bengali calendar	784
Berber calendar	2327
English Regnal year	50 Edw. 3 – 1 Ric. 2
Buddhist calendar	1921
Burmese calendar	739
Byzantine calendar	6885–6886
Chinese calendar	丙辰年 (Fire Dragon); 4074 or 3867; — to —; 丁巳年 (Fire Snake); 4075 or 3868
Coptic calendar	1093–1094
Discordian calendar	2543
Ethiopian calendar	1369–1370
Hebrew calendar	5137–5138
Hindu calendars
- Vikram Samvat	1433–1434
- Shaka Samvat	1298–1299
- Kali Yuga	4477–4478
Holocene calendar	11377
Igbo calendar	377–378
Iranian calendar	755–756
Islamic calendar	778–779
Japanese calendar	Eiwa 3; (永和３年)
Javanese calendar	1290–1291
Julian calendar	1377; MCCCLXXVII
Korean calendar	3710
Minguo calendar	535 before ROC; 民前535年
Nanakshahi calendar	−91
Thai solar calendar	1919–1920
Tibetan calendar	阳火龙年; (male Fire-Dragon); 1503 or 1122 or 350; — to —; 阴火蛇年; (female Fire-Snake); 1504 or 1123 or 351

Millennium:	2nd millennium
Centuries:	13th century; 14th century ; 15th century;
Decades:	1350s; 1360s; 1370s ; 1380s; 1390s;
Years:	1374; 1375; 1376; 1377 ; 1378; 1379; 1380;

Year 1377 (MCCCLXXVII) was a common year starting on Thursday (link will display the full calendar) of the Julian calendar.

Events

January–December

January – Battle of Đồ Bàn: Trần Duệ Tông, Trần dynasty Emperor of Đại Việt (Vietnam), is killed.
January 17 – Pope Gregory XI moves the Papacy back from Avignon to Rome.
January 27 – The Bad Parliament begins sitting in England. Influenced by John of Gaunt, 1st Duke of Lancaster, it undoes the work done by the Good Parliament, the previous year, to reduce corruption in the Royal Council. It also introduces a poll tax.
February – The Pope's representative in northern Italy, Robert of Geneva (the future antipope Clement VII), pillages Cesena, and 4,000 antipapal rebels are massacred.
March 2 – The Bad Parliament dissolves; the first Speaker of the House of Commons of England is appointed.
March 13 – Trần Phế Đế succeeds his late father as ruler of Vietnam.
May
- Continuous riots in Rome induce Pope Gregory XI to move temporarily back to Avignon.
- Władysław II Jagiełło succeeds his father, Algirdas, as Grand Duke of Lithuania. Jagiello removes his uncle, Kęstutis, as co-ruler.
May 22 – Pope Gregory XI issues five Bulls condemning the opinion of John Wycliffe, that Catholic priests should live in poverty, like the twelve disciples of Jesus.
July 16 – Richard II, the 10-year-old grandson of Edward III, is crowned king of England. A minority government is established, and a series of continual councils rule on his behalf until 1381.
July 27 – Fourteen-year-old Maria of Sicily succeeds her father, Frederick the Simple.
August – The Hongwu Emperor of the Ming dynasty of China scraps the Office of Reports Inspection (established in 1370) for a new Office of Transmission, in his efforts to create a more efficient communicatory system in the empire. A month before this he noted that anyone could send memorials to the throne; commoners often did, although the only times their petitions were read aloud to the emperor were when they called for the impeachment of local officials who were not up to par with their official duties.
August 2 – Battle on Pyana River: The Russians are defeated, while their commander drowns in the river.
October 13 – Richard II of England's first parliament meets.
October 26 – Tvrtko I of Bosnia is crowned.

Date unknown

Sayf ad-Din Barquq leads a revolt against the Mamluk Sultan of Egypt, Alah-ad-Din Ali.
A rebellion against the Majapahit Empire is quashed in Sumatra.
Informed that Khan Urus of the White Horde has died, Timur of the Timurid Empire sends Tokhtamysh to take the Horde throne, but is defeated by Urus' son, Timur Malik.
Radu I succeeds Vladislav I as Prince of Wallachia (modern-day southern Romania).
Harihara II succeeds Bukka Raya I, as ruler of the Vijayanagara Empire (in modern-day southern India).
King U of Goryeo adopts the Ming calendar and begs to be invested by the Hongwu Emperor.
The Trezzo sull'Adda Bridge is completed in Lombardy, and becomes the longest single-arch bridge in the world to be built for four centuries.
A sermon by a German monk states "the game of cards has come to us this year", and prohibitions against cards are issued by Prince John of Castile, and the cities of Florence and Basel.