Helake, Helius, Helyus
One of the two peasant brothers who were protégés of King Armant of the Delectable Isle and the Red City. They treacherously killed the king and seized his kingdom. Palamedes killed Helain and avenged King Armant’s death.
Helain is first found in the Prose Tristan, where his brother is unnamed. Malory gives variations of the name - Helake and Helyus - to both brothers. In La Tavola Ritonda, Helain is called Passauver. His name is a variation of Alain, and the spellings are interchangeable.
Helain de Taningues
Helaine, Helains de Tanningues
My people have often blamed me for delaying my entry into the order of chivalry,
but, after a dream twelve years before, Helaine’s mother made Helaine promise that he would not be knighted by anyone except Gawain; however, every time he sought Gawain at Camelot, Gawain was away on adventures. Eventually, the Lady of Roestoc, who Helaine served, insisted that he be knighted.
Helaine witnessed an unknown knight defeat Seguarades in combat, and decided that he would be knighted by the victor. He was delighted when he found out that the victor was in fact Gawain, and he was able to keep his promise to his mother. Gawaine dubbed Helain the next day, also promising Helain's beautiful sister to be her true knight, giving her a girdle and a locket which the Lady of Roestoc had given him.
It's possible Helain was a relative of the Lady of Roestoc.
Helain the Black
Helain the Brown
This weak knight was a brief companion of the Good Knight Without Fear.
Helain the Dragon
It's possible he is identical with Helains li Dragon.
Helain the White
Alain li Blanc, Helain li Blans, Helaine, Helaym, Helyam, Helyn
Helin le Blank | The Legend of King Arthur