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1390 ( ) was a MCCCXC common year starting on Saturday (link will display full calendar) of the Julian calendar.
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 – The Treaty of Königsberg is signed in Königsberg, during the Lithuanian Civil War, between Samogitian nobles and representatives of the Teutonic Knights. 
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. 
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.
Ottomans take Philadelphia, the last Byzantine enclave of any significance in Anatolia.
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) . "Vytauto jaunystė ir jo veikimas iki 1392 m". In Paulius Šležas (ed.). Vytautas Didysis (in Lithuanian). Vilnius: Vyriausioji enciklopedijų redakcija. p. 36. OCLC 25726071.
Gudavičius, Edvardas (1999). Lietuvos istorija. Nuo seniausių laikų iki 1569 metų (in Lithuanian). Vilnius: Lietuvos rašytojų sąjungos leidykla. pp. 173–174. ISBN . 9986-39-112-1
"Moctezuma I el Grande" [Moctezuma I the Great] (in Spanish). Biografias y Vidas.com . Retrieved . June 1, 2019