Brightlord Tumul was a lord who Wit addressed at a feast for then King Elhokar, and who Wit referred to as dull of mind. Further, Wit then told Tumul that it was unexpected to see him standing nearby Brightlord Habatab and that he hadn't meant to insult the man's stupidity, but that it was quite spectacular and worthy of much praise.[1]
Complete:This page has sparse information from the books. However, it does contain everything we have on the subject at this time.