What Happened in 1331
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- Sep 8 Stefan Dušan declares himself king of Serbia
- Sep 27 Battle of Płowce: Kingdom of Poland defeats the Teutonic Order in a strategic victory
- Feb 16 Coluccio Salutati, Italian political leader and humanist, Chancellor of the Republic of Florence (appointed 1375), born in Stignano (d. 1406)
- Oct 4 James Butler, 2nd Earl of Ormonde, born in Kilkenny Castle, Ireland (d. 1382)
- Jan 14 Odoric of Podenone, Italian Franciscan friar and explorer (travelled to India, Borneo and China) (b. 1286)
- Oct 27 Aboe al-Fida [Aboelfeda], Arabic writer/sultan of Hama, dies
- Nov 11 Stefanus VIII Uros III Decanski, king of Serbia (1322-31), dies
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List of Years