Time Lord

The Time Lord is a very powerful being, though it is not exactly clear what kind of being he is. He describes his job as ensuring that time flows smoothly through space, and in ordered paths. He adds that it is too complicated to describe to mortals, and that his actions are very important for the universe. He is clearly interested in the well-being of the worlds of the universe, and is opposed to forces of destruction and chaos.

Though he doesn't actually appear, it is implied in Ultima II that the Time Lord rescued the Stranger from the alterations in Earth's timeline (who else could?), so that the damage could be repaired. His first actual appearance was in Ultima III, where he was found at the bottom of the Dungeon of Time, and revealed the correct placement of the Four Cards, which would destroy Exodus.

A major player in Ultima VII, the Time Lord was Imprisoned by the Guardian in the Shrine of Spirituality. It was he who sent the Moongate to bring the Avatar back to Britannia. When the Avatar finally met him, the Time Lord explained to the hero what exactly was going on in Britannia, and that the Sphere Generator had to be destroyed in order to free him. He also gave the Avatar helpful advice about the defenses of the Cube Generator and what to do with Rudyom's Wand. That the Time Lord didn't appear in Ultima VII Part Two is strange.

Trivia

 * The Time Lord may be a reference to the BBC series Dr. Who; the Time Machine (which may have been procured for the Stranger by the Time Lord) seen in Ultima I resembles the TARDIS.