Edern ap Nudd

Edern ap Nudd (Latin: Hiderus;[1] Old French: Yder[2] or Ydier) was a knight of the Round Table in Arthur's court in early Arthurian tradition.

[3] Edern also appears in The Dream of Rhonabwy (a late medieval Welsh Arthurian romance) in which he commands a "pure black troop" of Danish soldiers allied to Arthur against the Saxons.

Outside Welsh-language writing, Edern is first seen in Geoffrey of Monmouth's Historia Regum Britanniae as Hiderus filius Nu, a knight of King Arthur's who fought in his Gallic campaign.

The poet Wace, in his adaptation of the Historia Regum Britanniae called the Roman de Brut, renders the name as Yder fils Nu(t).

The only time he may have been immortalised is on the famous archivolt (1120–40) at Modena, which shows a knight called Isdernus in a scene with King Arthur (Artus de Bretania), the captive queen Guinloie or Guenevere (Winlogee) and possibly Durmart (Burmaltus).