"My son, I know that you are the famous conqueror of giants. I know, at the top of this mountain there is an enchanted castle, kept by a giant named Galligantes, who, by the help of a magician, gets many knights into his power—whom he changes into beasts. Above all, I lament the hard fate of a duke's daughter, whom they have changed into a deer. Many knights have tried to destroy the enchantment, yet none have been able to do so, because of two fiery griffins who guard the gates of the castle. But as you, my son, have an invisible coat, you may pass them by without being seen. On the gates of the castle you will find engraved the means by which the enchantment may be broken."
Jack promised that in the morning he would risk his life in an endeavor to break the enchantment; and, after a sound sleep, he arose early and set out on his attempt.
He passed by the fiery griffins without the least fear of danger; for they could not see him, because of his invisible coat.
On the castle gate he found a golden trumpet hanging, under which were written these words—
"Whoever can this trumpet blow,
Shall cause the giant's overthrow."
Jack seized the golden trumpet and blew a mighty blast, which made the gates fly open and shook the castle to its foundations. The giant and the magician, knowing that their end was now near, stood biting their thumbs and shaking with terror. Jack, with his magic sword, soon killed the giant, and the magician was carried off by a whirlwind. The castle vanished away like smoke, and the duke's daughter and all the knights and lovely ladies who had been turned into birds and beasts returned to their proper shape.
Jack's fame rang through the whole country, and the King gave him a large estate to reward him for all his brave and knightly deeds. And Jack married the duke's daughter, and lived in joy and contentment for the rest of his days.