King Arthur's Excalibur Dagger

Arthur, also known as Artorius from his name Artorius Castus (Clive Owen), is portrayed as a Roman cavalry officer and commander, the son of a Roman father and a Celtic mother, who leads a military force of Sarmatian cavalry in Britain at the close of the Roman occupation in 467 A.D. He and his men guard Hadrian's Wall against the "Woads", a Celtic people who resist Roman rule, roughly based on the historical Picts, led by their mysterious leader Merlin. He is not the first Arthur - over the years, many of his ancestors have manned the Wall, leading Sarmatian auxiliaries.

Excalibur is the mythical sword of King Arthur, sometimes attributed with magical powers or associated with the rightful sovereignty of Great Britain. Sometimes Excalibur and the Sword in the Stone (the proof of Arthur's lineage) are said to be the same weapon, but in most versions they are considered separate. The sword was associated with the Arthurian legend very early; in Welsh, the sword was called Caledfwlch