People is highly regarded for its effort towards an accurate telling of history, and for its use of reliable sources. When passing along "traditional" information that lacks a historical foundation, Bede takes care to note it as such. The De Excidio et Conquestu Britanniae by Gildas (c. 516–570) is occasionally relevant in that it mentions early people and places also mentioned in the literary and historical sources. The work was intended to preach Christianity to Gildas' contemporaries and was not meant to be a history. It is one of the few contemporary accounts of his era to have survived. Place names Brittonic place names in Scotland south of the Forth and Clyde, and in Cumberland and neighbouring counties, indicate areas of Hen Ogledd inhabited by Britons in the early Middle Ages. Isolated locations of later British presence are also indicated by place names of Old English and Old Norse origin. In Yorkshire, the names of Walden, Walton and Walburn, from Old English walas "Britons or Welshmen", indicate Britons encountered by the Anglo-Saxons, and the name of Birkby, from Old Norse Breta "Britons", indicates a place where the Vikings met Britons. Dubious and fraudulent sources The Historia Regum Britanniae of Geoffrey of Monmouth is disparaged as pseudohistory, though it looms large as a source for the largely fictional chivalric romance stories known collectively as the Matter of Britain. The lack of historical value attributed to the Historia lies only partly in the fact that it contains so many fictions and falsifications of history; the fact that historical accuracy clearly was not a consideration in its creation makes any references to actual people and places no more than a literary convenience. The Iolo Manuscripts are a collection of manuscripts presented in the early 19th century by Edward Williams, who is better known as Iolo Morganwg. Containing various tales, anecdotal material and elaborate genealogies that connect virtually everyone of note with everyone else of note (and with many connections to Arthur and Iolo's native region of Morgannwg), they were at first accepted as genuine, but have since been shown to be an assortment of forged or doctored manuscripts, transcriptions, and fantasies, mainly invented by Iolo himself. A list of works tainted by their reliance on the material presented by Iolo (sometimes without attribution) would be quite long. Kingdoms and regions Major kingdoms Places in the Old North that are mentioned as kingdoms in