January 19– In Ming dynasty China, General Lan Yu is rewarded by the Emperor Zhu Chongba of the Hongwu era for his victory over Mongol invaders in 1388. Lan Yu is given the title Duke of Liang, with rule over what is now the Gansu province.
January 24– The University of Cologne (Universität zu Köln) begins operations and continues for more than 400 years before closing in 1798. It will be re-established in 1918.
February 24– Queen Margaret of Norway and Denmark defeats Albert, King of Sweden in battle and becomes ruler of all three kingdoms. Albert is deposed from the Swedish throne and taken prisoner.
March 14– The unpopular Sultan Tughluq Khan of Delhi is murdered and succeeded by his brother, Abu Bakr Shah. The assassins, including Abu Bakr, kill the Sultan Tughluq and his vizier, Jahan Khan.
June 2–Al-Salih Hajji becomes the Mamluk Sultan of Egypt and Syria a second time, replacing the Sultan Sayf ad-Din Barquq after having previously reigned from 1381 to 1382. Al-Salih rules until 1 February 1390, when he is overthrown by Barquq.
June 11– The Hättebröder, a group of German-speaking burghers during the reign of the German Albrecht as King of Sweden, arrest and imprison the Swedish mayor of Stockholm, Bertil Brun, and two other city officials, whom they hold for ransom. Brun and the other two officials become victims two weeks later of the Käpplinge murders.
June 17– On the night of the Feast of Corpus Christi, the Käpplinge murders (Käpplingemorden) take place in Sweden at Käpplingeholmen when 76 Swedish men are taken prisoner, convicted of treason, then burned alive in a barn.
July–September
July 12– English poet Geoffrey Chaucer, who has recently started writing of the works that will be assembled in The Canterbury Tales, is given a job to supplement his income as a writer when he is appointed by King Richard II of England as Clerk of the King's Works, overseer of the construction of royally-sponsored buildings.
September 30– King Charles VI of France and the Bishop Liébauld de Cousans of Verdun sign a treaty granting the Roman Catholic Church dominion over the city of Verdun. The treaty is approved five months later by Pope Clement VI on February 13, 1390.
October –December
October 25– The papal conclave to elect a new Pope opens at the Apostolic Palace in Rome with 13 cardinals, all of whom had been selected by Pope Urban during the years from 1378 to 1384.The three absentees (from France, England and Hungary) had also been elevated to the college of cardinals by Pope Urban.
November 1– The Antipope John XXIII, reigning from Avignon, crowns Louis II of Anjou as King of Naples, although the underage King Ladislaus has been recognized as the rightful monarch by the late Pope Urban VI of Rome. Louis II will move to Naples on August 6, 1390, while Ladislaus flees, but since his troops cannot occupy the entire Neapolitan kingdom, Louis is only recognized in the French-occupied areas of Naples.
December 31– In the Goryeo Revolution in Korea, 9-year-old King Wang Chang of Goryeo, and his father, the former King Wang U are assassinated by Prince Gongyang. The ten-year-old Chang and his predecessor, U, are both assassinated later in the year.
Biri II succeeds Kade Alunu as King of the Kanem-Bornu Empire (now eastern Chad and Nigeria), and the Empire loses its land in present-day Chad to the Bilala.
↑Caferro, William (2006). John Hawkwood: An English Mercenary in Fourteenth-Century Italy. Baltimore: The Johns Hopkins University Press. pp.285–288. ISBN0-8018-8323-7.
↑Louis Clouêt, (1870), Histoire de Verdun et du pays verdunois., volume 3 (in French). (Verdun: Ch. Laurent, 1870) p.41
↑Kiraz, George A. (2011). "Sobo, Ignatius". In Sebastian P. Brock; Aaron M. Butts; George A. Kiraz; Lucas Van Rompay (eds.). Gorgias Encyclopedic Dictionary of the Syriac Heritage: Electronic Edition. Gorgias Press. pp.381–382. Retrieved 26 December 2020.