Venerable Mahā-Kāśyapa was the most honorable among the Buddha’s disciples. Concerning his lineage, he was the son of Nyagrodha, a millionaire in Magadha, India. The house of his millionaire father was as huge as 1,000 tatami mats, with each mat being seven feet thick and costing at least 1,000 ryō (gold coins). His house had as many as 999 ploughs, each costing 1,000 ryō. It is also said that his house included 60 warehouses each containing 340 koku (about 1200 metric tons) of gold. Nyagrodha was a very wealthy person.
The wife of Mahā-Kāśyapa had a golden body so brilliant that it illuminated an area 16 ri (about 80 km) around herself. She was more beautiful than Princess Sotoori of Japan or Lady Li of Han China. Having aspirations for enlightenment, Kāśyapa and his wife became disciples of the Buddha and were guaranteed by the Buddha to become the future Light Buddha in the Lotus Sūtra.
Looking into their Buddhist practices in their prior existences, the husband was reborn as Venerable Mahā-Kāśyapa due to his offering of a bowl of barley rice to a pratyekabuddha. His wife, a poor woman, paid one gold coin to a Buddhist sculptor for gilding a statue of Vipaśyin Buddha and thereby was reborn as a beautiful golden woman to be the wife of Mahā-Kāśyapa.
Tokimitsu-dono Gohenji, Reply to Lord Tokimitsu, Writings of Nichiren Shōnin, Volume 7, Followers II, Pages 25