Question: Who was the legal grandson of the Earl of Merica?

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. <SEP> Baron Skelmersdale, of Skelmersdale in the County Palatine of Lancaster, is a title in the Peerage of the United Kingdom.  It was created in 1828 for the former Member of Parliament for Westbury, Newcastle-under-Lyme, Clitheroe and Dover, Edward Bootle-Wilbraham.  His grandson, the second Baron (the son of the Hon. Richard Bootle-Wilbraham), was a Conservative politician and served in the Conservative administrations of Disraeli and Lord Salisbury.  In 1880 he was created Earl of Lathom, in the County Palatine of Lancaster, in the Peerage of the United Kingdom.  However, the earldom became extinct on the death of his grandson, the third Earl, in 1930.  The barony passed to the last Earl's second cousin, the fifth Baron, who was the grandson of a younger son of the first Baron.  On his death the title was inherited by his cousin, the sixth Baron. <SEP> Viscount Fauconberg, of Henknowle in the Bishopric of Durham, was a title in the Peerage of England held by the head of the Belasyse family.  This family descended from Sir Henry Belasyse, High Sheriff of Yorkshire from 1603 to 1604, who was created a Baronet, of Newborough in the County of York, in the Baronetage of England in 1611.  His son, Sir Thomas, the second Baronet, was created Baron Fauconberg, of Yarm in the County of York, in the Peerage of England in 1627.  In 1643 he was further honoured when he was made Viscount Fauconberg, of Henknowle in the Bishopric of Durham, also in the Peerage of England.  He was succeeded by his grandson, Thomas, the second Viscount, the son of the Honourable Henry Belasyse.  Thomas was created Earl Fauconberg in the Peerage of England in 1689.  He was childless and the earldom became extinct on his death in 1700.  He was succeeded in the remaining titles by his nephew and namesake, Thomas, the third Viscount, the son of Sir Rowland Belasyse.  The third Viscount was succeeded by his son, Thomas, the fourth Viscount, who in 1756 was created Earl Fauconberg, of Newborough in the County of York, in the Peerage of Great Britain.  The Earl's son Thomas, the second Earl, had no sons and the earldom became extinct on his death in 1802.  He was succeeded in the remaining titles by his second cousin Rowland Belasyse, the sixth Viscount, the grandson and namesake of Rowland Belasyse, younger brother of the third Viscount.  The sixth Viscount was succeeded by his younger brother, Charles the seventh Viscount, on whose death in 1815 all the titles became extinct. <SEP>  He succeeded to his father's title and responsibilities on the latter's death in 1057.  He gained the additional title of Earl of East Anglia, but also was exiled for a time.  Through the first marriage of his daughter he would become father-in-law of the Welsh king Gruffydd ap Llywelyn; a few years after his death, his daughter would become a widow and marry English King Harold. Ælfgar (died c. 1060) was the son of Leofric, Earl of Mercia, by his famous mother Godgifu (Lady Godiva).