The Lewis Chessmen, or Uig Chessmen, are 78 12th-century chess pieces, most of which are carved in walrus ivory. The hoard was discovered in 1831 on the Isle of Lewis in the Outer Hebrides, Scotland. They may be some of the few complete, surviving medieval chess sets. They are owned and exhibited by the British Museum in London, which has 67 of the original pieces, and the National Museum of Scotland in Edinburgh, which has the remaining 11 pieces.