For hundreds of years, the ancient rules of royal succession have handed men the throne over the royal daughters. Britain's reigning monarch is Queen Elizabeth II. Both she and Queen Elizabeth, have served as queen for long times, but only because they did not have brothers before them. Today, at a meting of commonwealth nations in Perth, Australia, Prime Minister David Cameron announced a change to royal succession. Rafal Heydel-Mankoo is editor of Burke's World Orders, a guide to royalty and protocol.