The English pseudohistorian Geoffrey of Monmouth (ca. 1100-1155) is known for his "History of the Kings of Britain," through which he contributed greatly to the dissemination of the Arthurian legend throughout Europe.

Geoffrey was born in or near Monmouth, Wales. By 1129 he was residing in Oxford, probably as a member of a nonmonastic ecclesiastical community. He stayed at Oxford at least until 1151 and during this period wrote his two extant works, Historia regum Britanniae (1136-1138; History of the Kings of Britain) and Vita Merlini (ca. 1148; The Life of Merlin). Geoffrey was a keen observer of contemporary trends in historical writing and combined his observations with a fertile imagination and a consistent, if not profound, philosophical outlook about history to produce his brilliant pseudohistory of the Britons, the Celtic people which inhabited the island of Britain before being conquered by the Anglo-Saxons.

Historia regum Britanniae purports to be a...