Dunterton, Devon; and a chapel in Illogan, Cornwall. The two Devon sites may have been dedicated instead to Constantine the Great, as local churches were subject to Tavistock Abbey, dedicated to Constantine the Great's mother Helena. In Wales, two churches were dedicated to Constantine: Llangystennin (in Conwy) and Welsh Bicknor (now in Herefordshire, England). The church in Govan, a parish in present-day Scotland, was also dedicated to a Saint Constantine. Geoffrey of Monmouth and the chronicle tradition Historia Regum Britanniae Geoffrey of Monmouth includes Constantine in a section of his Historia Regum Britanniae adapted from Gildas. As he does throughout the work, Geoffrey alters his source material, recasting Gildas' reproved kings as successors, rather than contemporaries as in De Excidio. In addition to Gildas, Geoffrey evidently knew the Dumnonian genealogy essentially as it appears in Geraint and Enid and similar sources. He further adds a number of other details not found in earlier sources, identifying Constantine as a son of Cador, a Cornish ruler known in Welsh tradition as Cadwy mab Geraint. Notably, Geoffrey's Constantine is King Arthur's kinsman and succeeds him as King of the Britons. Norris J. Lacy and Geoffrey Ashe suggest Geoffrey made this Arthurian connection based on an existing tradition locating Arthur's birthplace in southwest Britain. However, noting that the earliest references place Arthur in northern Britain rather than the southwest, Rachel Bromwich considers the connection an arbitrary invention by Geoffrey, perhaps suggested by his earlier inventions of familial ties between Arthur and Constantine the Great and the usurper Constantine III. Geoffrey calls Constantine Arthur's cognatus, or blood relative, but does not specify the exact relation, causing much confusion for later writers. In Geoffrey, Arthur passes his crown to his relative Constantine after being mortally wounded by the traitor Mordred in the Battle of Camlann. Geoffrey identifies Gildas' "royal youths" as Mordred's two sons, who, along with their Saxon allies, continue their father's insurrection after his death. After "many battles" Constantine routs the rebels, and Mordred's sons flee to London and Winchester, where they hide in a church and a friary, respectively. Constantine hunts them down and executes them before the altars of their sanctuaries. Divine retribution for this transgression comes three years later when Constantine is killed by his nephew Aurelius Conanus (Gildas' Aurelius Caninus), precipitating a civil war. He is buried at Stonehenge alongside other kings of Britain. Latin scholar Neil Wright considers Geoffrey's