Lady Mary Anne Grenville Nugent Temple, first and surviving daughter of Mary Elizabeth and George, the first Marchioness and Marquess of Buckingham. See Family tree.  

• 8 July 1787 born at Stowe
• 1810 converted to Catholicism
• 26 February 1811 married Hon. James Everard Arundell, afterwards tenth Baron Arundell of Wardour:
  
  At that time a marriage in England in order to be legal (an exception was made in the case of Quakers) had to be celebrated by the Protestant clergyman. The marriage ceremony performed at Stowe had therefore to be repeated next day in Lon­don. The following is the memorandum preserved at Wardour Castle: "James Everard, 10th Lord Arundell of Wardour, married by special licence, 26th Feb., 1811, at residence of the Marquis of Buckingham, by the Rev. Thos. Wingfield, and by the Right Rev. Dr. W. Poynter, Vic. Ap., at the house of the Dowager Lady Arundell, 55, Baker St., London, 27th Feb., 1811." (Hirst, p9)
  
• No children
• 1 June 1854 died (according to DNB) or 2 July 1845 (according to Hirst).

Politician Edward Fox met Mary and her husband in Italy and was not particularly complimentary.

See also: Memoir and Letters of Mary Arundell (Hirst).