King of Britain after his father Beli Mawr; brother of Llefelys (king of France in the Mabinogi geographic-political imagination); eponymous founder of London (Welsh Caer Lludd, "Lludd's Fortress" — a medieval-Welsh folk-etymology subsequently entered into English-medieval-historical tradition through Geoffrey of Monmouth). The Llaw Eraint ("Silver Hand") epithet is cognate with Irish Nuada Airgetlám ("Nuada of the Silver Arm") — both deriving from a Proto-Celtic *Nōdens (the deity-name attested in the 4th-c. CE Lydney Park temple inscriptions in Gloucestershire as "Deo Nodonti"). The Welsh-Irish-Common-Brittonic Nōdens/Nuada/Lludd is a foundational deity-king-figure with healing, hunting, and silver-arm associations preserved across the Insular Celtic mythological tradition. The three-plagues-and-resolution narrative of the Cyfranc — the Coraniaid foreign people, the May-Eve dragon-shriek, and the magician-thief — is the central episode and one of the most-discussed political-magical episodes of the medieval Welsh tradition.