Chellah, or Sala Colonia is a necropolis and complex of ancient Roman Mauretania TingitanaJustin McGuinness, Footprint Morocco, 2003, 560 pages, ISBN 190347163X and medievalKen Bernstein, Morocco, 2001, Hunter Publishing, Inc, 64 pages ISBN 2884520031 ruins at Rabat, Morocco (...) (from Wikipedia)