MAHELOAS, BARON, LORD OF THE ISLE OF GLASS

Listing Maheloas among the vassal lords whom Arthur summoned to court of Erec's wedding.

Chrétien de Troyes describes his Isle of Glass as a place free from storm, thunder, lightning, snakes, toads, and extremes of hot and cold. This sounds to me like Avalon, and Avalon is usually identified with Glastonbury; yet further on in the same passage Chrétien names Morgan's lover Guingomar as lord of the Isle of Avalon. Possibly an example of one place - and character? - being split into two.