Isn't
Queen Hereafter about the Anglo-Saxon princess, Margaret, who married Malcolm III of Scotland?
Not long ago I came across a historical mystery featuring Margaret's daughter
Edith - Jeremy Potter's
Death in the Forest (1977). It's set in the period following the Norman Conquest and features Edith of Scotland, the Rose of Romsey. Edith later married Henry I of England, and took the name Matilda. In a shrewd move Henry united Norman blood with that of the old English royal line. All three of William the Conqueror's sons appear in the novel and an unpleasant lot they are, too!