January 20 – The Parliament of England is opened at Westminster by King Henry IV.
February 3 – The Byzantine Emperor Manuel II Palaiologos, who has spent almost two months in England as the guest of King Henry IV, accepts a payment of 3,000 English gold marks in support of an alliance between the two nations, then makes plans to depart England for France.[4]
Jingnan campaign: After a month's recovery from defeat in battle in China, Prince Zhu Di mobilizes his troops at Beijing and marches south to fight the Ming dynasty Jianwen Emperor.[3]
March 2 – William Sawtrey, a Roman Catholic priest and adherent to the Lollard faith becomes the first person in England to be burned at the stake under the new De heretico comburendo law (officially the Suppression of Heresy Act 1400), dying at Smithfield, London after being convicted of heresy against the Roman Catholic faith.[5]
March 10 – As the English Parliament session closes, King Henry IV gives royal assent to the Suppression of Heresy Act, permitting secular authorities to carry out punishment for religious crimes. The assent comes after the Archbishop of Canterbury pressures King Henry to outlaw the Lollards, followers of John Wycliffe, and criminalizes possession of a copy of Wycliffe's translation of the Bible.
March 13 – The Samogitians, supported by Grand Duke Vytautas of Lithuania, rebel against the Teutonic knights and burn two castles. Vytautas is granted increased autonomy by King Jogaila of the Poland–Lithuania union.
April 28 – King Zsigmond of Hungary refuses to comply with demands of the Archbishop John Kanizsai and the Palatine Derek Bebek, he is taken prisoner. Sigismund remains captive until October 29.
May 6 – The council of the Republic of Venice passes a law prohibiting the Republic's executive, the Doge, from using the state owned official ship, the bucentaur, from being used for private purposes.[8]
June 15 – Jingnan campaign: The rebel Yan forces destroy the food supplies of the Ming Chinese government at Dezhou.[3]
June 25 – The Schaffhausen massacre of 30 Jewish residents, by burning, of the town of Schaffhausen takes place in Switzerland after the April 3 murder of 4-year-old Konrad Lori.[9]
July 9 – (27 Dhu al-Qadah 803 A.H.) Timur raids the city of Baghdad, in the Jalayirid Empire, then carries out a massacre of its inhabitants, including women and children, as punishment for resisting his rule. According to accounts later, "90,000 human heads were piled up on the public places of the town."[10] The only persons spared death are "theologians, shaikhs and dervishes", and the only buildings not demolished are "mosques, universities and hostels."[11]
December 2 – Jingnan campaign: Rebel General Zhu Di adopts a new approach in his war against the Chinese Imperial troops and departs from Beiping to drive troops southward to the Yangtze River, capturing Dong'e, Dongping, Wenshang, and Pei over the next two months.[3]
^Kenneth M. Setton, The Papacy and the Levant (1204-1571), Volume I: The Thirteenth and Fourteenth Centuries (The American Philosophical Society, 1976) p.374
^Ibn Khaldun (1952). Ibn Khaldūn and Tamerlane: Their Historic Meeting in Damascus, 1401 A.d. (803 A. H.) A Study Based on Arabic Manuscripts of Ibn Khaldūn's "Autobiography,". Translated by Walter Joseph Fischel. University of California Press. p. 97.
^"Timur, Sultan", in Biography or Third Division of The English Cyclopedia, Volume 6, ed. by Charles Knight (Bradbury, Evans & Company, 1868) p.77
^"Timur in Iran", by H. R. Roemer, in The Cambridge History of Iran, Volume 6, ed. by Peter Jackson and Laurence Lockhart (Cambridge University Press, 1968) p.66
^Demotz, Bernard (2000). Le comté de Savoie du XI au XV. Slatkine.