Thousand and one nights?

Thousand and One Nights is a Persian frame story, based on the courage of Shahrazad to save other women from the tragic fate which befell all other wives of Shahrayar. How does she convince the bitter king, who plans to kill her after their wedding night, to spare her life? What purpose does the Tale of the Ox and the Donkey play in the Vizier’s attempt to dissuade his daughter from sacrificing herself?