Lludd Llaw Eraint
Lludd Llaw Ereint, "Lludd of the Silver Hand", son of Beli Mawr, is a legendary hero from Welsh mythology. As Nudd Llaw Ereint (the earlier form of his name, cognate of the Irish Nuada Airgetlám, derived from the pre-Roman Celtic god Nodens) he is the father of Gwyn ap Nudd. He is probably the source of king Lud from Geoffrey of Monmouth's "History of the Kings of Britain". In the "Mabinogion" tale of "Lludd and Llefelys", which influenced Geoffrey of Monmouth's work, he is the ruler of Britain while his brother Llefelys ruled Gaul . Lludd calls on Llefelys to rid Britain of three plagues then afflicting the kingdom. Philological connection suggests that there was once a memorial to Lludd at the site of St Paul's Cathedral, London, near Ludgate, which is named after him. Etymology. The name Nudd, cognate with the Irish Nuada and related to the Romano-British Nodens or Nodons worshiped at Lydney Park in Gloucestershire, probably derives from a Celtic stem *"noudont-" or "*noudent-", which J. R. R. Tolkien suggested was related to a Germanic root meaning "acquire, have the use of", earlier "to catch, entrap (as a hunter)", and  together with the "silver hand" epithet detects "an echo of the ancient fame of the magic hand of Nodens the Catcher". Similarly, Julius Pokorny derives the name from a Proto-Indo-European root "*neu-d-" meaning "acquire, utilise, go fishing". The name Nudd Llaw Ereint probably assimilated and shifted to Llud Llaw Ereint through alliteration, as suggested by John Rhys and later by Joseph Vendryes. The byname "Llaw Ereint" or "llawereint" is glossed as "of the Silver Hand" or "Silver-handed". Welsh "eraint" is listed as meaning "a round body; a ball; a bowl, a cup; a pear", probably related  to the adjective "erain" "abounding with impulse", but "ereint" has been defined as "silver cup", no doubt owing to Welsh "arian" "silver".