Check out Princess O'Rourke (1943) on TCM July 13, 2014
www.imdb.com/title/tt0036277 Check your local listings
I think it's fascinating to see the similarities between Roman Holiday and Princess O'Rourke. Olivia de Havilland stars in Princess O'Rourke, as well as Robert Cummings, Charles Coburn, Jack Carson and Jane Wyman (who was endearing in this).
Roman Holiday is the better film, in my opinion, but Princess O'Rourke is worth watching and has fun moments.