H.R.H. Augustus Frederick (1773-1843), was the 6th son of George III by Charlotte Sophia. His titles included, Prince of Great Britain and Ireland; Duke of Brunswick-Luneburg; He was also created Baron of Arklow in Ireland, Earl of Inverness in North Britain, and created Duke of Sussex on Nov. 27, 1801.
The Duke was a great bibliophile, and his library was expanded book-by-book (as opposed to large acquisitions) from 1819 to 1830. His librarian and surgeon, Thomas Joseph Pettigrew, oversaw the library's expansion and cataloged its contents. A catalogue of the theological manuscripts was published in 1827 under the title "Bibliotheca Sussexiana." Of the Duke's 50,000 manuscripts, 12,000 were theological and 51 were in Hebrew. The Duke was known for spending lavish amounts of money on his library to purchase new volumes and to build custom-made bookcases.
Fincham, Henry. Artists and engravers of British and American book plates, a book of reference for book plate and print collectors. London: K. Paul, Trench, Trübner & Co., ltd., 1897. 74.