In ancient times there lived a great king named King Makara [sic] in the state of Vārāṇasī in India. The king had two sons: Zen’u (Virtuous Friend) and Aku’u (Evil Friend). Zen’u possessed the wish-fulfilling gem. In order to steal Zen’u’s precious gem, the younger brother Aku’u plucked Zen’u’s eyes out. King Makara in the past is King Śuddhodana today, and Prince Zen’u is Śākyamuni Buddha while Prince Aku’u is Devadatta now. Though brothers, they fought over the gem life after life until one of them attained Buddhahood while the other fell into the Hell of Incessant Suffering.

Hyōesakan-dono Gohenji, Answer to Lord Ikegami Munenaga, Writings of Nichiren Shōnin, Volume 6, Followers I, Page 97