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.
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