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.
John Erskine, Earl of Mar (1558–1634) John Erskine, Earl of Mar (c. 1562 – 14 December 1634) was a Scottish politician, the only son of another John Erskine. He is regarded as both the 19th earl (in the 1st creation) and the 2nd earl (in the 7th).