Martingo

Martingo is the self-proclaimed "Sultan of Spektran", ruler 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 Draxinusom had sold his Ether Ring to him some years ago. Martingo was totally useless, babbling only delusional gibberish, but informed the Avatar that he/she could have the ring, if he/she managed to get it from his secure vault. 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 and delusions.

He probably still is in his own, little kingdom.

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.