on 13 July 1761. He was appointed Dean of the Sacred College of Cardinals on 26 September 1803, then also succeeding to the See of Ostia and Velletri. He lived and worked in Frascati for many years, descending each afternoon in his carriage to Rome, where his position as vice-chancellor entitled him to the Palazzo della Cancelleria.

Henry was the last claimant to the British throne