Saduj

Saduj is found during the events of Ultima V, sneaking around the roof of Castle Britannia in the night, acting suspiciously.

Description
At first Saduj didn't say much. He claimed to be a gardener if prompted. However, after the Avatar revealed to be a member of the Oppression by saying the password "IMPERA", Saduj became much more talkative. Saduj was a spy sent by Lord Blackthorn to get possession of the Sandalwood Box, to ensure that Lord British would be sealed in the dungeon Doom permanently. He then offered his services to the Avatar's party.

Ultima V: Lazarus
In Ultima V: Lazarus, Weldon the gardener would be infuriated if the hero mentioned Saduj and his claimed profession, feeling that Biggs was attempting to replace him as head gardener.

Strategy
Should the player let Saduj join, he will betray the party in combat as soon as possible.

Therefore, the player can let Saduj join, but any equipment should be removed from him at once, and leave him at the nearest inn (in Britain or Britanny).

The usefulness of Saduj is in the gold earned by selling his equipment.

Trivia

 * In the alleged journal of the Avatar discovered by historians Robert DeMain and Carlotta Stein, the Avatar describes Saduj as dark-skinned and somewhat shorter than Iolo (Iolo talked with Saduj instead). His hair is described to be black and clothing consisted of a very dark tunic and breeches as well as a cap on his head.
 * Amusingly, one can let Saduj join the second character space; and then make one's way to Blackthorn's castle without entering into a battle. Getting captured then means that Blackthorn will execute him, and Saduj's ashes will appear in the Codex.
 * Appropriately, "Saduj" is Judas spelled backwards.
 * Even worse, in Lazarus, Saduj steals the Sandalwood Box and flees, meaning an instant game over.