"Oh, father, I have lived so many years with you, I have so often walked in the garden, and I have never seen such a delightful bird as I saw there just now!"
Then she began to ask her father to give her his blessing and to wed her to Donotknow. And for all the father might do to convince her, she insisted. "If you will not give me to him, I will remain unmarried all my life and will seek no other man." So the father agreed and he betrothed them.
Soon afterwards the Arab Prince wrote to him for the third time and asked for the hand of his youngest daughter. "If you will not consent, I will consume all of your kingdom with fire, and I will take her by main force."
Then the King answered, "My daughter is already promised: if you wish, come yourself and you will see. So the Prince came, and when he saw what a monster was betrothed to the fair Princess he thought he would slay Donotknow, and he summoned him to mortal combat.
Donotknow shook off his oxhide, took the bladder from his head, summoned his good horse and rode out, so fair a youth as no tale can tell and no pen can write.
They met in the open field, in the wide plains, and the list lasted long. Iván the merchant's son killed the Arab Prince. Then at last the King recognised that Donotknow was not a monster but a splendid and handsome knight, and he made him his heir. Iván the merchant's son lived on in his kingdom for good and lived all for happiness, took his own father to stay with him, but consigned his stepmother to punishment.