The most important is a painting by John Phillips, which Mr Ondaatje found in a private Australian collection, of SirRichardBurton in Afghan dress before his ill-fated journey to find the source of the Nile.
Professor Stead also spoke about Houston's close friendships with fellow Welsh actors RichardBurton and Sir Stanley Baker, his love of the Rhondda and how his classic good looks, warm spirit and openness endeared him to cinema goers of all ages.