Devadatta was a grandson of King Siṃhahanu, a son of King Dropodana who was an uncle of Śākyamuni Buddha, and an elder brother of Venerable Ānanda. His mother was a daughter of Suprabuddha. As a member of the Wheel-turning Noble King’s clan, Devadatta was a man of distinguished background in the continent of Jambudvīpa. Prior to entering the Buddhist Order, he lost to Prince Siddhārtha for the hand of Princess Yaśodharā and was possessed with the idea that Siddhārtha was his sworn enemy. After entering the priesthood, moreover, he was rebuked by the Buddha before a crowd of human and heavenly beings, “You are a fool who eats the saliva of other people.” Moreover, he greatly valued fame and satisfying desires and felt envious of the Buddha being regarded with such respect by people. Thus Devadatta practiced the five ways, pretending to be more venerable than the Buddha; branded the wheel of 1,000 spokes (one of the Buddha’s 32 physical characteristics) on the sole of his foot; collected fireflies to pretend that he, like the Buddha, had a white curl between the eyebrows; preached all the Buddhist teachings, said to be 60,000 or 80,000 in number, as if they all are his own; established a precept dais on Mt. Gayāśīrṣa to induce many disciples of the Buddha; and attempted to inject poison into the Buddha’s foot through his own toenail. Moreover, he beat Nun Utpalavarṇā to death, and threw a large stone causing the Buddha’s foot to bleed.

Thus, he committed the three rebellious sins (causing the Buddha’s body to bleed, causing disunity in the Buddhist order, and killing an arhat), and in the end gathered all the evils in all of India and caused harm to the Buddha and His disciples and donors. King Bimbisāra, the primary supporter of the Buddha, sent 500 vehicles filled with donations daily to the Buddha. Envious of this, Devadatta seduced Crown Prince Ajātaśatru to imprison the father king and finally crucified him with seven-foot-long nails. Because of such grave sins as these, Devadatta finally fell into the Hell of Incessant Suffering through the hole in the ground of the northern gate of the town of Rājagṛha. All the people in the whole world without exception witnessed this event, believing that Devadatta would never be able to come out of this hell even after having spent incalculable number of aeons (kalpa as many as the number of dust-particles of the great earth) there. Nevertheless, he was made to become the Heavenly King Buddha in the Lotus Sūtra. This is indeed inexplicable yet precious. If Devadatta does not become a Buddha, the numerous evil people who were induced by him to enter into the evil comradeship would never be able to escape the torment of the Hell of Incessant Suffering. It is solely due to the great favor of the Lotus Sūtra that all of Devadatta’s evil comrades too, are allowed to be Buddhas. Devadatta and his numerous followers, accordingly, will stay in the residences of those who practice the Lotus Sūtra. Thus, I feel we can count on them.

Kitō Shō, Treatise on Prayers, Writings of Nichiren Shōnin, Faith and Practice, Volume 4, Page 64-65