The duke of Cornwall in the Vulgate Merlin and Arthour and Merlin. In the former, he takes the role usually assigned to Gorlois, while in the latter he precedes Tintagil as Igerne’s husband. Arthour names him as Igerne’s second husband, after Harinan. Their daughters were Blasine, Belisent, and Brimesent (Hermesent).
This Hoel is also mentioned in the Vulgate Merlin Continuation, where he is given the title Duke of Tintagel. He is also named as being among the Twenty-Four Knights of King Arthur’s Court.
Sources
Vulgate Merlin | 1220-1235
Arthour and Merlin | Late 13th century