The name 'Arthur' was unheard of until the 6th century. The earliest reference is found in the poem 'Gododdin' written in AD 600. It mentions a warrior and states, ' he was no Arthur'. This suggests that the writer's audience were familiar with the figure. So, there was somebody at the time or just before known by that name. Herein lies a puzzle, there was no such name but someone was know by it around the end of the sixth century. He must have been popular and well respected. Suddenly, many people name their children after him. Rather than a name, 'Arthur' was a title made up of two words, Brythonic (Ancient British) 'Arth' and Latin 'ursus'. Both words carry the definition 'bear'.
So, having determined that there was a popular warrior figure known by the title 'Arthur', let us now consider what was know of Arthur: He had a Christian faith. He led a coalition of warrior leaders. He was betrayed by a relative. He fought against the Saxons. He was betrayed by one of his own men and subsequently died in battle. There is only one man who led a coalition of warriors against the Saxons at the end of the 6th Century. His name was Urien of Rheged (Cumbria). He was a Christian. He was betrayed by a relative (another member of the coalition) whilst the Saxons were besieged on Lindisfarne. An ancient poem contained in the Red Book of Hergest' tells us that his head was severed from his body and he was buried beneath blue stones at Aber (mouth of) Low. The mouth of the River Low is to be found opposite the Holy Island of Lindisfarne. A burial mound can be seen there till this day.