Leslie Stephen,
Dictionary of National Biography…
(1896)
“ PETTY-FITZMAURICE, HENRY, third Marquis of Lansdowne (1780–1863) , statesman, was the only son of the second marriage of William Petty, second earl of Shelburne and first marquis of Lansdowne [q. v.] His mother was Lady Louisa Fitzpatrick, daughter of John, earl of Upper Ossory. He was born on 2 July 1780 at Lansdowne House, and was educated at Westminster School, under the special care of a private tutor, the Rev. Mr. Debarry, and from his earliest years was trained with a view to public life. ”
