The 750-year-old Black Book of Carmarthen is the first Welsh text to include medieval figures such as King Arthur and Merlin... Now, thanks to high resolution photography and UV lighting, some of its secrets have finally been revealed... The collection of poetry and illustrations was penned by one scribe in the 13th Century who added to it over the years. It was then passed from owner to owner, with more additions being made in the margins... But 300 years after it was first written the then owner, believed to be Jaspar Gryffyth, decided to purge the pages of anything that...