I'm not sure which part of Arthurian legend your mentioning as original here, because Arthurian legends are... A rather deep well with no real canon as such. In

I'm not sure which part of Arthurian legend your mentioning as original here, because Arthurian legends are... A rather deep well with no real canon as such. In the oldest versions, there is no sword in the stone, for example [0]. Along that line, Lancelot, who everyone knows, was a self-insert fanfic at one point. [1] [0] L'Estoire des Engles [1] Lancelot, le Chevalier de la charrette