Trant Thumble was the patriarch of House Thumble and ruler of Caer and Mastwick. Trant took over these cities in a bloody revolution many years ago, and demanded lots of money in taxes. To keep the people happy he would stage tournaments where his adopted "children" were made to fight in gladiator-style combat against monsters and challengers. Trant was generally only interested in strange races, to make his menagerie as exotic as possible. He was a ruthless ruler and cared very little for the lives of his children beyond their ability to keep his populace entertained.
Trant was the original owner of Blood Drinker.
Years after being completely forgotten about, Queen Aludra Wyrmsbane was plagued by a dream of him killing young Bucky with the destroyed sword Blood Drinker. The nature of this dream, be it a projection, prophecy, warning, etc., remains unknown.