Lavish, sometimes mystical boards appear often in medieval Welsh literature. In "The Dream of Rhonabwy", a prose tale associated with the , King Arthur and play the game with golden men on a silver board. In another prose tale, "The Dream of ", the character is carving men for his golden board when he is visited by the emperor . The board of is named as one of the Thirteen Treasures of the Island of Britain in lists dating from the 15th and 16th centuries; according to the lists the board is gold and the men silver, and the pieces play against each other automatically. A magic comparable to 's appears in the Arthurian romance "Peredur son of Efrawg"; a number of French versions of the Holy Grail story feature similar chessboards with self-moving pieces, following the Second Continuation of 's "Perceval, the Story of the Grail", though in these only one side moves, while the hero plays the other.