Yeah I know the Magna Carta's real, and that Arthur could have existed, and Robin Hood might have been based on one person or a group of persons, but that makes those myths.

Or like that story of the piper who is asked to remove the rats of the town with his flute, but when the town dosent pay him he makes the children get out by the same way... That was based on a real incident, a tragedy that occurred lots of centuries ago, but no historian was able to decipher how did it happen, why did it happen, and if it happened like the story.