Deaths on December 4

Aymer de Valence, Bishop of Winchester (b. 1222)

Aymer de Valence (c. 1222 – 4 December 1260) was a Bishop of Winchester around 1250.

13 Jul

Battle of Durbe
The Livonian Order suffers its greatest defeat in the 13th century in the Battle of Durbe against the Grand Duchy of Lithuania
3 Sep

Battle of Ain Jalut
The Mamluks defeat the Mongols at the Battle of Ain Jalut in Palestine, marking their first decisive defeat and the point of maximum expansion of the Mongol Empire.
4 Sep

Battle of Montaperti
The Sienese Ghibellines, supported by the forces of Manfred, King of Sicily, defeat the Florentine Guelphs at Montaperti.