Walter de Milemete was an English

England

England is a country that is part of the United Kingdom. It shares land borders with Scotland to the north and Wales to the west; the Irish Sea is to the north west, the Celtic Sea to the south west, with the North Sea to the east and the English Channel to the south separating it from continental...

 scholar who wrote a treatise on Kingship for the young prince Edward, later king Edward III of England called De nobilitatibus, sapientiis, et prudentiis regum in 1326. The Treatise includes images of siege weapons and what is probably the first illustration of a firearm: a pot-de-fer

Pot-de-fer

The pot-de-fer was a primitive cannon made of iron. It is known as the first metal cannon, and was used by the French in the Hundred Years' War. The name means "iron pot" in French...

. One of the marginal border illustrations in the Milemete Treatise shows a soldier firing a large vase-shaped cannon, the arrow-shaped projectile is seen projecting from the canon which is pointed at a fortification. In the 1331 siege of Cividale

Cividale del Friuli

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, German knights used guns which were probably very similar to Milemete weapons.