The Emperor Sujin advised his two sons, Toyokino-mikoto (Toyokiiribikono-mikoto) and Ikumeno-mikoto (who later became the Emperor Suinin), that he could not decide which one of them should succeed to him as he equally loved both of them, and that he would make the decision through divination that would be facilitated by the dreams his two sons would have.
崇神天皇は豊城命（豊城入彦命）と活目尊（いくめのみこと、垂仁天皇）に勅して、共に慈愛のある子でありどちらを後継者とするか決めがたいため夢占いをすると伝えた。