Martingo

Martingo is the self-proclaimed "Sultan of Spektran", ruling of the isle of Spektran in Ultima VII. But in reality he is just a rich man who has lost his mind, going totally bonkers. Still, he has the best guarded treasure chamber of all in Britannia.

The Avatar had to meet him when it became clear that Lord Draxinosum had sold his Ether Ring to him. Martingo was totally useless, but informed the Avatar that he could have the ring, if he managed to get it. It was a trap, as the ring was guarded by a Stone Harpy. Defeating the harpy and retrieving the Ether Ring, the Avatar left Martingo alone with his madness.

Trivia

 * Martingo's madness shows itself, beside others things, by talking to non-existent people, having a imaginary harem, believing himself a big ruler and a fetish for bananas.