(MCCCXC) was a common year starting on Saturday (link will display full calendar) of the Julian calendar.
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January–December
- January 19 – The Treaty of Lyck confirms an alliance between Vytautas and the Teutonic Knights, in the Lithuanian Civil War against Vytautas's cousin, Jogaila.
- April 14 – John VII Palaiologos overthrows his grandfather, John V Palaiologos, as Byzantine Emperor.
- April 19 – Robert III succeeds his father, Robert II, as King of Scotland.
- May 26 – Lithuanian Civil War: The Treaty of Königsberg is signed in Königsberg, between Samogitian nobles and representatives of the Teutonic Knights.[1]
- September 11 – Lithuanian Civil War: The coalition of Vytautas and the Teutonic Knights begins a 5-week siege of Vilnius. The Duke of Hereford (the future King Henry IV of England) is among the western European knights serving with the coalition.[2]
- September 17 – John VII Palaiologos seeks refuge with the Ottoman sultan Bayezid I, after John V Palaiologos is restored by his son, Manuel, and the Republic of Venice.
- October 9 – Henry III succeeds his father, John I, as King of Castile and León.
Date unknown
- Fall of Philadelphia
- Barquq is restored as Mamluk Sultan of Egypt, after overthrowing Sultan Hadji II.
- Nasir ud din Muhammad Shah III overthrows his brother, Abu Bakr Shah, as Sultan of Delhi.
- Manuel III succeeds his father, Alexios III, as Emperor of Trebizond (now north eastern Turkey).
- Sikandar But-shikan succeeds Sikandar Shah, as Sultan of Kashmir.
- Ko Cheng succeeds Che Bong Nga, as King of Champa (now eastern Vietnam).
- Mahmud succeeds Sandaki as Mansa of the Mali Empire, restoring the Keita dynasty.
- N'Diklam Sare succeeds Sare N'Dyaye, as ruler of the Jolof Empire (now part of Senegal).
- The Kingdom of Kaffa is established in present day Ethiopia (approximate date).
- Templo Mayor, the main temple of the Aztec capital of Tenochtitlan (now Mexico City), is built.
- The Candi Surawana Temple is built in the Majapahit Kingdom (now Indonesia).
- Construction begins on San Petronio Basilica in Bologna.
Ivinskis, Zenonas (1988) [1930]. "Vytauto jaunystė ir jo veikimas iki 1392 m". In Paulius Šležas (ed.). Vytautas Didysis (in Lithuanian). Vilnius: Vyriausioji enciklopedijų redakcija. p. 36. OCLC 25726071.