Who was the legal grandson of the Earl of Merica?
Ealdgyth, daughter of Earl Ælfgar Ealdgyth ("fl. c". 1057–1066), also Aldgyth or in modern English, Edith, was a daughter of Ælfgar, Earl of Mercia, the wife of Gruffudd ap Llywelyn (d. 1063), ruler of all Wales, and later the wife and queen consort of Harold Godwineson, king of England in 1066. She was described by William of Jumièges as a considerable beauty.
Henry Percy, 11th Duke of Northumberland Henry Alan Walter Richard Percy, 11th Duke of Northumberland FRS (1 July 1953 – 31 October 1995), styled Earl Percy until 1988, was a British peer. He was the eldest son of Hugh Percy, 10th Duke of Northumberland and a godchild of Queen Elizabeth II.