More on the historical background of Arthur HERE from film force

Britannia page on King Arthur

Vortigern Studies: "Questing for the historical Arthur, King of Britons"

The Faces of Arthur

Where Didn't King Arthur Come From?

BBC page on Arthur

Arthuriana

A Gazetter of Arthurian Sites

The Encyclopaedia of the Celts

Lucius Artorius Castus, commander of a detachment of Sarmatian conscripts stationed in Britain, led his troops to Gaul to quell a rebellion. This is the first appearance of the name, Artorius, in history and some believe that this Roman military man is the original, or basis, for the Arthurian legend. The theory says that Castus' exploits in Gaul, at the head of a contingent of mounted troops, are the basis for later, similar traditions about "King Arthur," and, further, that the name "Artorius" became a title, or honorific, which was ascribed to a famous warrior in the fifth century.