1390

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.
• September 11 - Lithuanian Civil War: The coalition of Vytautas and the Teutonic Knights begins a 5-week siege of Vilnius. The Duke of Hereford 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.

  Date unknown

• The 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.
• Sikandar But-shikan succeeds Sikandar Shah, as Sultan of Kashmir.
• Ko Cheng succeeds Che Bong Nga, as King of Champa.
• 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.
• The Kingdom of Kaffa is established in present day Ethiopia.
• Templo Mayor, the main temple of the Aztec capital of Tenochtitlan, is built.
• The Candi Surawana Temple is built in the Majapahit Kingdom.
• Construction begins on San Petronio Basilica in Bologna.