Peter Townsend
1914-1995. War veteran, Princess Margaret and he wanted to marry in 1955, but - after pressure from the Church, parts of the media, politics and the Royal family - Margaret decided against it.
Peter Wooldridge Townsend was born in 1914. He distinguished himself as a pilot in the Royal Air Force and had the rank of Group Captain. Later he worked as the Queens equerry. Princess Margeret is said to have had a crush on him since the first time she saw him on a tour to South Africa. She was only 14 years back then and he was already married and had two children. He later got divorced from his wife. In June 1953, during the coronation of Queen Elizabeth, the press observed Margaret brushing a hair from Group Captain Townsend`s uniform. From that moment on the public was also interested in their affair.
Sources:
http://news.bbc.co.uk/onthisday/hi/dates/stories/october/31/newsid_3202000/3202307.stm
http://www.nytimes.com/1995/06/21/obituaries/peter-townsend-dies-at-80-princess-margaret-s-love.html