Helidus
A King of Ireland. He served Arthur.
Coming across two knights fighting, he asked the cause of their quarrel. The dueling knights stopped fighting each other and attacked Elidus instead. The skilled Elidus defeated both of them, learned that they had been fighting over a woman, visited the lady’s castle, and avenged himself on the knights by spending the night with the lady.
Source
Claris et Laris | 1268