Arthur

If you love King Arthur and his world, [or Morgan Le Fay's, to be fair, for those who have The Mists of Avalon book or movie],  check out the amazing illustrations American painter N.C. Wyeth [1882-1945] did on that world. He was taught by the famous illustrator Howard Pyle.

There are a few examples here, and here at WikiArt [use the horizontal scroll bar near the bottom]. The piece "The Death of Guenever" is one of his more somber, rare quiet paintings, it's really beautiful.

Sir Tristram getting killed by King Mark as Tristram played the harp for Isolde is amazing: