1901: Queen Victoria died; Edward VII became king. If, however, the throne had passed to the firstborn child, regardless of sex, Victoria would have been succeeded by her daughter Vicky. And consider this: when Vicky died, as she did just a few months later, her eldest child, Wilhelm, would have become king. Already kaiser of Germany, Wilhelm would have also become William V of Britain.
Source: The Independent, 7 July 2006