Marsor's Isle

Description
Marsor's Isle is a small uninhabited island which appeared during the time of Ultima IV and Ultima V. Initially home to the vineyards of the wine merchant Marsor, the island was otherwise unremarkable, and had disappeared from the Great Sea by the time of Ultima VI.

Ultima V: Lazarus
In Ultima V: Lazarus, a large brood of dragons had taken up residence on the island, using it to rear there young and as a storehouse for the vast array of gold and magic equipment they had accumulated.