A knight who married a fairy ruler, but lost her (and his own handsome features) when he revealed her existence to others. To reclaim her, he had to journey to Arthur’s court, defeat three knights, and take them to her land of Fluratrone. He managed to capture Walban, Gawain, and Yvain, and he was thereby reconciled with his wife.
Afterwards, he spent a year with Arthur, he rescued the Count of Asterian’s daughter from a kidnapper.
Gauriel had a pet ram which he had trained to fight, his companion on the adventures. The romance featuring him was German, written by Konrad von Stoffeln.
Source
Gauriel von Muntabel | Late 13th century