King of Northgalis in La Tavola Ritonda.
He went to war with Amoroldo, King of Ireland, over a castle called Lerlinte, which was championed by Lancelot. Tristan supported Alois. Through the interventions of Guinevere and Iseult, the two leaders were eventually reconciled, in Amoroldo’s favor.
After the Grail Quest, Alois renewed the war, and was killed in combat by Amoroldo.
Oddly, one Ansalinero is named as the king of North Wales in the same story.
Source
La Tavola Ritonda | 1325-1350