The full, ancient text: Historia Regum Britanniae.Historia regum Britanniae (or The History of the Kings of Britain) is a supposedly historical account written by Geoffrey of Monmouth in 1136. Though much of the text is largely considered fiction, it does pull from several ancient texts and true historical events/personas.It is notable for being the first, major blockbuster-like success of the Arthurian legends, bringing the character to widespread...