Mongibel, Montgibel
The home of Morgan le Fay in Floriant et Florete and Le Chevalier du Papegau.
In the former, it is said to be in Sicily. Floriant retires at Montegibel with his wife Florete at the end of their lives.
Folklore identifies it with Mount Etna.
Sources
Le Chevalier du Papegau | Late 14th century or early 15th century
Floriant et Florete | c. 1250–1275