A Knight of the Round Table who embarked with the others on the Grail Quest. He joined company with Agamenor and Arpian of the Narrow Mountain. All three knights hated Lancelot's family, so they attacked Galahad, but were defeated.

Later, they assaulted Acorante the Agile (Acorant) and Danubre the Brave, Lancelot's cousins. Amatin was slain by Danubre.