He took his seat in the House of Lords in February 1830, taking the special version of the oath for Roman Catholic peers.
[2] Lord Arundell of Wardour married Mary Anne Nugent-Temple-Grenville, daughter of George Nugent-Temple-Grenville, 1st Marquess of Buckingham, and Mary Elizabeth Nugent, 1st Baroness Nugent, at Buckingham House, London, in 1811.
The marriage produced no surviving heir[citation needed].
He died in Rome in June 1834, aged 48, and was succeeded in the barony by his younger brother, Henry.
Lady Arundell of Wardour died in June 1845, aged 57.