William the Conqueror, King of England is your 25th great grandfather. William I (Old Norman: Williame I; c. 1028 – 9 September 1087), usually known as William the Conqueror, sometimes William the Bastard, was the first Norman King of England, reigning from 1066 until his death in 1087. The descendant of Viking raiders, he had been Duke of Normandy since 1035 under the style William II. By 1060 his hold on Normandy was secure and he launched the Norman conquest of England in 1066.
