Withur d'Acqs, count of Léon (Parzival)

Withur (also Ider, Idrus). Originally, he was Sir Ither in Arthurian legend, a cousin of King Arthur. He is said to have been a son of Yvain (Geoffrey of Monmouth). In later tradition he was turned into a pseudo-historical count of Léon, son of Owain mab Urien of Rheged..

For more about the Arthurian character Sir Ither, see Yder at nightbringer.se.

Wikipedia

Red Knight is a title borne by several characters in Arthurian legend.

The first is likely the Red Knight of the Forest of Quinqeroi in Chrétien de Troyes' Perceval, the Story of the Grail; he steals a cup from King Arthur and is killed by the protagonist Perceval, who wears his armor and comes to be known as the Red Knight himself. In Wolfram von Eschenbach's Parzival, a retelling of Chrétien, the Red Knight is identified as Sir Ither, the Red Knight of Kukumerlant, a cousin to both Arthur and Parzival. He is killed by Parzival.

Sources

• http://fabpedigree.com/s072/f089528.htm
• http://fabpedigree.com/s036/f544764.htm
• http://wc.rootsweb.ancestry.com/cgi-bin/igm.cgi?op=GET&db=feonadorf...
• Wikipedia: Red Knight