1391

January–December

• June 6 - Anti-Jewish pogroms erupt in Seville, Spain. Many thousands of Jews are massacred, and the violence spreads throughout Spain and Portugal.
• July 18 - Tokhtamysh–Timur war: Battle of the Kondurcha River - Timur defeats Tokhtamysh of the Golden Horde, in present day southeast Russia.
• August 5 - Anti-Jewish riots spread to Toledo, Spain and Barcelona. Many Jews leave Barcelona after the following massacres, though a large number remain in the city.

  Date unknown

• Manuel II Palaiologos becomes Byzantine emperor after his father, John V Palaiologos, dies of a nervous breakdown, due to his continued humiliation by the Ottoman Empire.
• Yusuf II succeeds Muhammed V, as Nasrid Sultan of Granada.
• Stephen Dabiša succeeds Stephen Tvrtko I, as King of Bosnia.
• Shah Mansur becomes leader of the Timurid-occupied Muzaffarid Empire, in central Persia.
• A group of Muzaffarids under Zafar Khan Muzaffar establish a new Sultanate at Gujarat, in western India.
• Vytautas the Great, claimant to the throne of Lithuania, forms an alliance with Muscovy.
• Roman I succeeds Petru, as Prince of Moldavia.
• Konrad von Wallenrode succeeds Konrad Zöllner von Rotenstein, as Grand Master of the Teutonic Knights.
• Bridget of Sweden is canonized by Pope Boniface IX.
• Ushkuinik pirates from Novgorod sack the Muscovy towns of Zhukotin and Kazan.
• The Chinese invent toilet paper for use by their emperors.
• Henry I Sinclair, Earl of Orkney, takes control of the Shetland Islands and the Faroe Islands.
• The University of Ferrara is founded on the Italian Peninsula.
• The Ming government orders 50 million trees planted in the Nanjing area.