The Once and Future King - The Sword in the Stone

The Once and Future King is an Arthurian fantasy novel written by T. H. White. It was first published in 1958 and is mostly a composite of earlier works written in a period between 1938 and 1941.
The title comes from the inscription of the marker over King Arthur's grave, the internally rhymed hexameter: Hoc iacet Arthorus, rex quondam, rexque futurus — "Here lies Arthur, formerly king, and king to be."