3rd » The Mamluks defeat the Mongols at the Battle of Ain Jalut in Palestine (region) known as Palestine, marking their first decisive defeat and the point of maximum expansion of the Mongol Empire.
4th » The Siena Sienese Ghibellines, supported by the forces of Manfred, King of Sicily, defeat the Florence Florentine Guelphs at battle of Montaperti Montaperti.
20th » the Great Prussian Uprising among the old Prussians begins against the Teutonic Knights.