February 24–Elizabeth of Bosnia, the mother of the overthrown Queen Mary of Hungary and Croatia, arranges the assassination of Charles III of Naples, the ruler of Hungary, Naples, Achaea and Croatia, with the result that Mary is reinstated as Queen of Hungary and Croatia; Charles' son, Ladislaus, becomes King of Naples; and a period of interregnum begins in Achaea, lasting until 1396. The rule of Achaea is sought by numerous pretenders, none of whom can be considered to have reigned.
June 9– Queen Elizabeth of Hungary pledges to assist King Wladyslaw II of Poland against his enemies, the Teutonic Knights, who question the legitimacy of the King's marriage to Queen Jadigwa.[7]
Battle of Sempach: Soldiers from cantons of the Old Swiss Confederacy defeat the Austrian Habsburg Army in a battle that leads to the unification of the cantons into the nation of Switzerland.