Mary was the short-lived, little-favoured Catholic, Elizabeth the long-reigning, all-admired Protestant. Or so history has told us. But these two daughters of Henry VIII had more in common than meets the eye.
After her death many of Princess Margaret's extraordinary jewels and possessions were put up for auction by her children in order to pay her inheritance tax.
These included the tiara that she wore at her wedding to Lord Snowdon.
Originally noticed for her striking resemblance to Princess Diana, Sophie Rhys-Jones, wife of Prince Edward could not have been more different.
As an independent career woman the stage was set for a very modern Royal marriage.