- Oct 3 Beauvais cathedral in France is completed (choir and transept), designed to be the largest French Gothic cathedral ever built
- Nov 20 Edward I proclaimed King of England after death of his father, Henry III. He would take two years to return to England from the Ninth Crusade.
- Nov 21 Following Henry III of England's death on November 16, his son Prince Edward becomes King of England.
- Mar 14 Enzo of Sardinia, illegitimate son of Emperor Frederick II von Hohenstaufen who appointed him King of Sardinia (1238-49) and poet, dies in prison
- Mar 17 Emperor Go-Saga of Japan (b. 1220)
- Apr 2 Richard, 1st Earl of Cornwall, Holy Roman Emperor (b. 1209)
- Apr 17 Zita, Italian maid and saint from Lucca, dies at about 59
- Aug 6 Stefanus V, prince of Transylvania/king of Hungary (1270-72), dies
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