The Duke of Nuts is a character of Adventure Time. He rules the Duchy of Nuts. His family is normal sized, having a wife who is the Duchess of Nuts, and two sons which the older one is the Marquis of Nuts and a much younger son, who is the Second Nut Son. He first came out in the episode "The Duke," where Princess Bubblegum was first seen chasing him out of her kingdom. He was also seen in the episode Henchman for his son's first birthday. He knows Marceline as well.
He wears a blue outfit with a red cape. He also wears a red hat.