According to Brewer’s Dictionary of Phrase and Fable, Galligantus lived with Hocus-Pocus in an enchanted castle. By his magic he changed men and women into dumb animals, amongst which was a duke’s daughter, changed into a roe. Jack the Giant Killer, arrayed in his cap, which rendered him invisible, went to the castle and read the inscription: “Whoever can this trumpet blow, will cause the giant’s overthrow.” He seized the trumpet, blew a loud blast, the castle fell down, Jack slew the giant, and was married soon after to the duke’s daughter, whom he had rescued from the giant’s castle.