King Arthur (Dates unknown)

It is possible that the legendary Arthur, associated with the Welsh legends of the 10th century, is based on the historical figure who commanded a British force against the Saxons. According to the 9th-century historian Nennius, this Arthur defeated the Saxons at Mount Badon in 518 and died at Camlan in 537. Further references to Arthur can be found in Gildas who wrote the polemical work De excidio et conquestu Britanniae ('The Ruin of Britain') and the chronicles Geoffrey of Monmouth (12th-century).
The Arthur of legend is first characterised in the Welsh Mabinogi, a collection of medieval tales, and it is this literary character who is associated with Company of the Round Table and the search for the Holy Grail.