He and Alexander the Orphan (Alisander le Orphelin) mortally wounded each other.
Helin le Blank
Hellaine, Helain, Elain, Elyan the White
Like Percivale and Galahad, Helin, the son of Sir Bors and King Brandegoris' daughter, appears to have been knighted at the age of fifteen, and at about the same time as Galahad. He became a knight of the Round Table and "proved a good knight and an adventurous". He was eventually to become emperor of Constantinople.
"Le Blank" signifies "the white" and is also an appellation of Elaine of Astolat; I find the resemblance in the names of two such different characters very interesting.
Helain the White | The Legend of King Arthur
Helin the Red
A murderous knight born in incest.
Helin had sons named Alibon, Marran, and Helin.