The Duke is the duke of the country over which Queen Grimhilde and later Snow White ruled. He seems to be a fun-loving person, as he hosts, each year, a Halloween party and costume contest. He was known to have one year awarded the prize to Snow White instead of the Queen, angering the latter.
Behind the scenes
The Duke first appeared in The Scariest One of All in 2002, although the story itself took place before that date.