Sir Elyan the White or Helyan le Blanc is the son of Sir Bors and is a Knight of the Round Table in Arthurian legend. His mother is King Brandegoris' daughter Claire, who tricked Bors into sleeping with her using a magic ring; this is sometimes said to be the only time Bors broke his vow of chastity. When he is older Elyan is accepted as a member to the Round Table, where he becomes known as an excellent knight. Like his father and the rest of his family, Elyan helps his cousin Lancelot rescue Guinevere after their affair is exposed, and joins him in exile.
Elyan's mother Claire is the half-sister of Sir Sagramore; their mother is the daughter of the Eastern Roman Emperor. According to the Lancelot-Grail Cycle, Elyan eventually became Emperor of Constantinople himself.