 On top of the Redoubt are the remains of a Roman Pharos, or lighthouse, which complemented the one that still exists in the grounds of Dover Castle.Both date from the 2nd Century AD, and would have been similar in design lighting the cliffs either side of the Roman Port of Dubris.The remains were lost during the first period of construction, but were re-discovered during the second period and restored to their original position as a rather shapeless lump of masonry.