How to be a British royal
7 April 2011 Last updated at 06:32 BST
Britain has had kings and queens for hundreds of years, but longevity has not always guaranteed popularity.
From time to time they have even lost their heads.
Today's royals do not have to fear the chop, but that does not mean they can afford to ignore the great British public.
Katty Kay explains the dos and don'ts for being a member of the British Royal Family, helped by author and social commentator Peter York, former tabloid editor Kelvin MacKenzie and David Seidler, screenwriter of The King's Speech.
Watch clips from previous royal weddings on the BBC's history of royal weddings website