Maheloas, Maloans of Treverain
One of Arthur’s barons in Chrétien’s Erec, from the Welsh Melwas. He was the lord of the Glass Isle (Island of Glass) or the Black Isle.
Heinrich von dem Türlin conflates him with Chrétien’s Count of Treverain, calling him Maloans of Treverain.
Sources
Erec | Chrétien de Troyes, late 12th century
Diu Crône | Heinrich von dem Türlin, c. 1230