 Geoffrey of Monmouth's pseudohistorical "History of the Kings of Britain" goes into great detail concerning Lucius and names the pope's envoys to him as Fagan and Duvian.The 12th-century "Book of Llandaf" placed the court of Lucius in southern Wales and names his emissaries to the pope as Elfan and Medwy.An echo of this legend penetrated even to Switzerland.