Grisandoll, Grisodoles
A damsel named Avenable went to the court of Julius Caesar, disguised as a page, and calling herself Grisandoles, after Frolle (Frollo) had driven her father and mother away from their country. The Emperor of Rome made her a seneschal of all his land.
She introduced Merlin to the court and eventually married Julius Caesar.
See also
Romenie | The Legend of King Arthur
Sources
Vulgate Merlin | 1220-1235
Prose Merlin | Mid-15th century