About the legendary King Arthur, Guinevere, Lancelot, Merlin and the Knights of the Round Table. Le Morte d'Arthur was first published in 1485 by William Caxton, and is today perhaps the best-known work of Arthurian literature in English. Many modern Arthurian writers have used Malory as their principal source, including T. H. White in his popular The Once and Future King and Tennyson in The Idylls of the King.