Lord Thibris, from Ultima Underworld II
Lord Thibris is a retired soldier and the nominal ruler of Killorn Keep.
In his time as an active soldier, he was quite dangerous. Indeed, it was he who single-handedly won the campaign on Rhiannon by killing the leader, Praecor Loth, with a single, well placed arrow. However, even Thibris grew older and when his active time as a soldier came to an end, fate was less than kind to him. Thibris was proclaimed the ruler of Killorn Keep, but this post had no power at all. He basically was just there as the "nice story-telling uncle", who would entertain any visitors and had little say in the administration of the castle.
Meeting him in Ultima Underworld II, the Avatar listened to Lord Thibris' story of the Loth campaign and learned hints about the Tomb of Praecor Loth and the mighty Horn of Praecor Loth hidden within (for example, Thibris talked about the eight map parts). Lord Thibris also mentioned the Guardian's interest in the Horn, which lead the Avatar to conclude that it would be an artifact worth acquiring.
When the Avatar later killed Relk in combat, Lord Thibris wrote it off as a mere accident.