There is almost no history of the 5th/6th century in Britain. Mostly we have references in chronicles and other documents written centuries later.
Accordingly, historians disagree very much even over whether Arthur even existed. So there are no “facts” at all about Arthur, much less “10 facts”.
The battle of Badon(Badonicus) is mentioned in Gildas. See http://www.fordham.edu/halsall/source/gi... . This is the sole piece of writing from 5th/6th century Britain and does not mention Arthur. But Gildas mentions few names, so that proves nothing. However some scholars ascribe the Battle of Badonicus to Ambrosius Aurelianus or to unknown leaders, and think that the ascription to the legendary Arthur was only made later.
The finding of Arthur's body at Glastonbury is usually considered to be a monkish forgery. But that can’t be “proved”. The identification of the fairy isle of Avalon with Glastonbury would be part of that forgery. The mention of the “vaus d’Avaron” (“vales of Avalon”) in Robert de Boron’s “Joseph of Arimathea” was usually considered to be a reference to Glastonbury predating the supposed find of Arthur’s body. It was considered important that the text refers to “vales” not “isle”. However Robert de Boron was a Burgundian, and it is now recognized that it is just as possible, perhaps more probable, that the reference is to the town of Avallon in Burgundy.
Note also that in this romance, Joseph himself remains in the Middle-east, unlike later accounts.
The Round Table is also probably a later invention. The ancient Celts did not normally eat at tables, but ate sitting around a central hearth. There was originally not even a word for table in Welsh. The modern word is “bwrd” and is borrowed from Old English “bord” meaning “board”. A table was just a board laid on trestles. Compare the modern phrase “room and board”.
Some story teller may have described Arthur's men setting in a circle when eating, and some hearers who could not imagine eating without a table, imagined the Round Table.
See http://www.heroicage.net/issues/1/halac.... or the theory that the legendary Arthur was actually Lucius Artorius Castus of the second century.
See http://www.britannia.com/history/arthur/... for various quotes by supposed historians about Arthur.
So what are these “basic facts” that you know? The medieval tales themselves disagree on many points and scholars disagree on whether any of the accounts in these tales or other mentions are historical.
Jallan 2 weeks ago