Margaret fell in love when she was 23 with Group Captain Peter Townsend who worked for the royal family.
Their romance was like something out of a fairy tale: he was a handsome heroic war pilot and she was a beautiful young princess.
But their love was doomed.
He was divorced and Church of England rules said no royal could marry someone who was divorced.
Peter Townsend was sent to work in Brussels for two years. When he returned, Margaret was 25 and old enough to marry without permission.
But she decided not to as it would mean giving up all her royal rights. They stayed best friends until he died in 1995.