Reginald de Dunstanville, Earl of Cornwall

Reginald was born in Dénestanville in the Duchy of Normandy, an illegitimate son of King Henry I (1100–1135) by his mistress Sybilla Corbet of Alcester[1] who was a daughter and co-heiress of Sir Robert Corbet, lord of the manor of Alcester, Warwickshire, and wife (at some point) of "Herbert the King's Chamberlain".

[2][3][4] According to Carew William Camden gave an alternative account, with Henry I investing Reginald as earl of Cornwall, after taking it from William, Count of Mortain who rebelled against him in 1104; however, Camden's own account has Henry II advancing Reginald to the position, while making preparations to fight Stephen.

[6] By 1141, Stephen's forces had been beaten and Reginald was invested with the Earldom of Cornwall by his half-sister Matilda in 1141.

Reginald married Mabel FitzWilliam, daughter of William FitzRichard, a substantial landholder in Cornwall, by whom he had the following progeny: Reginald also had illegitimate children by his mistress Beatrice de Vaux (also known as de Valle), the daughter of Hubert I de Vaux and later the wife of William Brewer: Reginald died at Chertsey, Surrey, and was buried in Reading Abbey.

You can help Wikipedia by expanding it.This biography of an earl or countess in the Peerage of England is a stub.