Drudwas ap Tryffin

Drudwas ap Tryffin is a knight of King Arthur's court in early Arthurian mythology and the owner of the magical Adar Llwch Gwin. His father, Tryffin, is described as the king of Denmark, while his sister, Erdudwyl, was, according to The Death of Drudwas, supposedly a “mistress” of Arthur.