'Gaston, fair nephew,' said the King, 'you see how your father, the Count, holds your mother in bitter hate—a sore grief to me and to you also. Now to change all this, and bring your father and mother back to their ancient love, you must watch your chance and sprinkle a little of this powder on any food that your father is about to eat, taking good care that no man sees you. And the powder is a charm so strong that your father, as soon as he has tasted it, will desire nothing so much as to be friends with your mother again, and never will they leave each other. But you must take heed that no man knows of this purpose, or all is lost.'
The young Count, believing, in his innocence, what his uncle said, made answer that he would gladly do as he was bidden. Then he rode back to Orthez, and showed his father all the presents and jewels that had been given to him in Navarre, except the little purse.
Now it was the custom of the young Count to be much in the company of his brother by another mother, and, as they played together one day, this boy, named Yvain, caught hold of the little purse which Gaston wore about his neck under his coat, and asked him what it was. But Gaston made no answer. Three days later the lads quarrelled over a stroke at tennis, and Gaston struck Yvain a blow. Yvain ran weeping to his father, the Count, who asked what ailed him.
'The Count leaped up, a knife in his hand'
'Gaston struck me,' said he, 'but it is Gaston, not I, who deserves a blow.'
'What has he done?' asked the Count.
'Ever since he came from his mother's in Navarre he carries about his neck a little purse full of a powder. But I only know that he says you and his mother will soon be good friends once more.'
'Ha!' cried the Count, 'do you be silent.'
That day at dinner, as Gaston served the meats, for this was his duty, the Count called to him, seized his coat, opened it, and, with his knife, cut the purse from the boy's neck. Gaston said no word, but grew pale and trembled. The Count opened the purse, spread the powder on a piece of bread, and threw it to a dog. No sooner had the dog eaten the bread than his eyes turned round, and he fell dead.