He was the second son of Henry Nevill, 2nd Earl of Abergavenny, KT (1755-1843) and his wife Mary Robinson (d. 26 Oct 1796), only child of John Robinson MP, of of Sion Hill and Wyke House, co. Middlesex, Secretary to the Treasury, by his wife Mary Crowe, of Barbados. Married 2 Feb 1813 Mary Anne Elcock (d. 6 Jun 1828), dau. of Bruce Elcock, of Chelsea, London
Styled Viscount Nevill, after the premature death of his elder brother Henry Goeorge Nevill, in April 1806, when he became heir apparent to his father, but died at Boulogne-sur-Mer, in 1826, before his father.
He served on H.M.S. Victory in the Battle of Trafalgar, and in 1806 he was a Lieutenant on board Admiral Lord Collingwood's Flag ship. He obtained the rank of Captain in 1811, in the Royal Navy.Arms: Gules, on a saltire, argent, a rose of the first, barbed and seeded proper.
Crest: In a ducal coronet or, a bull's head, argent pied sable, armed of the first and charged on the neck with a rose gulesMotto: Ne vile velis