by John Marshall, Royal Naval Biography — Greville… (1823)
“ Algernon Greville, second son of Fulke, fifth Lord Brooke, ancestor of the present Earl of Warwick, by Mary, daughter and co-heiress of Lord Arthur Somerset, fifth son of the Duke of Beaufort. His grandmother was Miss Macartney, of Granard, county Longford, Ireland, a rich heiress. ”
