Some British monarchy rules mean that royal women don't have the same rights as men. For example — despite being the reigning monarch, the Queen's title is considered lower in rank than a king.
When she turned 18, at her own insistence, Princess Elizabeth joined the Auxiliary Territorial Service. She remains the only woman in the royal family to have served in the military.
"The day I walked down the aisle at St. Paul's Cathedral, I felt that my personality was taken away from me, and I was taken over by the royal machine."