The Old Man of Lochnagar is a children's book written by Prince Charles and illustrated by Sir Hugh Casson.The story revolves around an old man who lives in a cave in the cliffs surrounding the corrie loch under the Lochnagar, a mountain which overlooks the royal estate at Balmoral in Scotland where the Royal Family spend much of their summer holidays. The story of the old man of Lochnagar was one Prince Charles had told some years earlier to entertain his brothers, Andrew and Edward, when they were young. The book was published in 1980 in aid of The Prince's Trust charity.