There is some evidence for a historical King Arthur, but he was not a king of all Britain, did not have knights in armour (armour as we usually think of it was long after Arthur's time), and certainly never had a Sir Lancelot in his menyie. (Lancelot seems originally to have been a different story from Arthur, the two got mixed in together sometime in the middle ages).
So the story of King Arthur is fictional, though it may have a very slight basis in fact. The same is true of the legend of Wyatt Earp when you look into it. Wyatt Earp was a real person, and really was involved in a gunfight at the OK Corrall - but most of the Wyatt Earp story apart from that is pure hokum.
No King Arthur and his Knights of the Round Table is not nonfiction.
King Arthur was betrayed by some of the members of Knights of the Round Table. The two knights are Lancelot and Morded.
the knights of the round table
King Arthur's men are the Knights of the Round Table.
King Arthur and the Knights of Justice - 1992 was released on: USA: September 1992
they were knighted by king Arthur
King Harold is the King of medieval Europe in the knights tale
King Arthur of Britain.
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a knight?
In chairs.
The legendary King Arthur and his knights, known as the Knights of the Round Table, guarded over the court of Camelot.