William the Conqueror is the 22nd great-grandfather of Queen Elizabeth II and Queen Emma was his great-aunt.
Queen Emma
Born in the 980s, the daughter of Richard I, Duke of Normandy
Married two kings - Æthelred the Unready (reigned 1002-1016) and Cnut the Great (reigned 1017-1035)
Had children including two kings - King Harthacnut (reigned 1040-1042) and Edward the Confessor (reigned 1042-1066)
A key political figure in her own right, she gave the dukes of Normandy a hereditary claim to the English throne, leading to the Norman Conquest in 1066
Described in a Latin inscription on a mortuary chest as the "mother and wife of the kings of the English"