Cowper married Lady Henrietta, younger daughter of Henry de Nassau d'Auverquerque, 1st Earl of Grantham, a relative of the Dutch House of Orange-Nassau, and a count of the Holy Roman Empire.
Granville was the only son of Charles Granville, 2nd Earl of Bath, by his second wife Isabella, sister of Henry de Nassau d'Auverquerque, 1st Earl of Grantham.
Earl of Grantham was a title in the Peerage of England created once on 24 December 1698, along with the titles Viscount Boston, of Boston in the County of Lincoln, and Baron Alford, of Alford in the County of Lincoln, for Henry de Nassau d'Auverquerque.
Henry VIII of England | Henry VIII | Henry Kissinger | Nassau | Henry Wadsworth Longfellow | Henry II of England | Henry II | Nassau, Bahamas | Henry III of England | Henry IV of France | Henry IV | Henry | Henry Ford | Henry James | Nassau County, New York | Henry VII of England | Henry III | James Earl Jones | Prince Edward, Earl of Wessex | Louis Mountbatten, 1st Earl Mountbatten of Burma | Horatio Nelson, 1st Viscount Nelson | Henry Moore | Henry Miller | Henry I of England | Henry Clay | Herbert Kitchener, 1st Earl Kitchener | Henry IV of England | Patrick Henry | Henry Mancini | Henry V |