By area

Africa

• Mansa Sakura usurps the throne of the Mali Empire.

Asia

• April 25 – Mamluk sultan Al Mansur Qalawun begins a siege of the Crusader fortress of Margat (in modern-day Syria), a major stronghold of the Knights Hospitaller thought to be impregnable; he captures the fortress a month later.
• June 14 – Trần Hưng Đạo leads Vietnamese forces in victory over an invading Mongol fleet of the Yuan Dynasty, at Chuong Duong.

Europe

• January 6 – Archbishop Jakub Świnka orders all priests subject to his bishopry in Poland to deliver sermons in Polish rather than German, thus further unifying the Catholic Church in Poland, and fostering a national identity.
• April – Chios is captured by Venetian raiders from its Genoese lords; it is later retaken.
• Easter – The Second Statute of Westminster is passed in England, reforming various laws; it includes the clause de donis conditionalibus, considered one of the fundamental institutes of medieval law in England.
• September 4 – Roger of Lauria defeats King Philip III of France, in a naval battle off Barcelona.
• The writ Circumspecte Agatis, issued by King Edward I of England, defines the jurisdictions of church and state in England, thereby limiting the church's judicial powers to ecclesiastical cases only.

By topic

Arts

• The English romantic poem The Lay of Havelok the Dane is written (approximate date).

Markets

• The first record is made of an emission of life annuities, by the city of Lübeck. It is the first instance of issue of public debt in Germany, and it confirms a trend of consolidation of local public debt over north-western Europe (see 1228).^[1]
• The county of Champagne is integrated into the kingdom of France; the region loses its haven characteristics for foreign merchants, and the fairs of Troyes quickly dwindle into economic insignificance.^[2]

Religion

• April 2 – Pope Honorius IV succeeds Pope Martin IV, to become the 190th pope.
• Council of Blachernae: The Eastern Orthodox Church repudiates the Union with the Roman Catholic Church, declared in the Second Council of Lyon.