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February 22 - Pope Nicholas IV succeeds Pope Honorius IV as the 189th pope.

June 5 - John I of Brabant defeats the duchy of Guelders in the Battle of Worringen — one of the largest battles in Europe of the Middle Ages — thus winning possession of the duchy of Limburg. The battle also liberates the city of Cologne from rule by the Archbishopric of Cologne; it had previously been one of the major ecclesiastical principalities of the Holy Roman Empire.

August 8 - Pope Nicholas IV proclaims a crusade against King Ladislaus IV of Hungary, who had lost credibility by favoring his semi-pagan Cuman subjects and in general refusing to conform to the social standards of western Europe.

The Scots Parliament creates a law allowing women to propose marriage to men during leap years; men who refuse such proposals are required to pay a fine to the spurned bride-to-be.

The oldest surviving bell in the clocks atop the dome of St. Peter's Basilica in Rome dates to 1288.

Work is begun on the construction of Mob Quad in Merton College, Oxford.

Vietnamese general Tran Hung Dao sinks the entire fleet of an invading Yuan dynasty Mongol army by placing steel-tipped bamboo stakes in the Bach Dang River, near Halong Bay.

The Japanese era Koan ends, and the Shōō era begins.

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April 5 - Emperor Go-Fushimi of Japan (died 1336)

November 26 - Emperor Go-Daigo of Japan (died 1339)

Gersonides, Jewish philosopher, mathematician, and astronomer (died 1344)

Ivan I of Russia (died 1340)

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Gertrude of Austria (born 1226)

Richard de Clare, 6th Earl of Hertford (born 1222)

Ibn Nafis, Arabic anatomist, discoverer of the circulation of the blood (born 1210)

Guy de Montfort, Count of Nola (approximate date; born 1244)

Toros Roslin, Armenian miniaturist (approximate date; born c. 1210)