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Aragon's Alfonso III releases Charles the Lame on condition that he retain Naples alone, that Sicily remain an Aragonese kingdom, and that he persuade his cousin Charles of Valois to renounce the kingdom of Aragon given him by the late Pope Martin IV.
Pisa's Archbishop Ruggieri degli Ubaldini accuses the city-state's tyrannical podesta Ugolino della Gherardesca of treason in hopes of restoring the republic (see 1284). Ugolino is imprisoned with two of his sons and two grandsons in the tower of Gualandi, where he will die next year of starvation.
Cologne's Hanseatic merchants defeat the forces of the city's archbishop at the Battle of Worringen and secure full self-government after years of effort by the archbishop to preserve his temporal power. The city's rich patricians will control its government for more than a century (see 1396).
Vietnamese military strategist Tran Hung Dao engages Kublai Khan's Mongol fleet in a battle at the mouth of the Bach Dang River (see 1287). Using a stratagem borrowed from the 10th century king Ngo Quyen, Tran has his men implant iron-tipped spears beneath the surface of the water and then lure the Chinese junks into the river, where they are ripped apart.
