Welsh

"The legendary figure of Arthur was remarkably consistent in local British folklore for over a thousand years, from its first appearance in the ninth century to folklore current in the nineteenth; but learned authors, the intermediaries through whom we have received our knowledge of early Welsh traditions, sometimes gave their own interpretations of the character – either for their own reasons or because they knew of Arthur’s wider literary reputation – rather than giving a close portrayal of the traditional figure. For this reason it is essential, when studying the portrayal of Arthur in a particular text, to try to understand the nature and purpose of that text; yet the understanding of individual texts is naturally a subjective matter."

— Arthur in Medieval Welsh Literature by O. J. Padel