Who was the legal grandson of the Earl of Merica?
Ælfgar, Earl of Mercia Ælfgar (died c. 1060) was the son of Leofric, Earl of Mercia, by his famous mother Godgifu (Lady Godiva). 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.
Countess of Derwentwater Amelia Matilda Mary Tudor Radclyffe, soi-disant Countess of Derwentwater, was a 19th-century claimant to the estates of the Earls of Derwentwater. She claimed to be the granddaughter of John Radclyffe, only son of the third Earl, and in 1860 commenced to agitate for her rights, initially contacting Lord Petre as the representative of descendants of the family using the name of Lady Matilda Radclyffe.