It says in the “Bodhisattva Wonderful Voice” chapter that there was a bodhisattva named Myōon or Wonderful Voice, in the eastern world of the Buddha King Wisdom of the Pure Flower Constellation. This bodhisattva was once Lady Jōtoku, or Pure Virtue, the wife of King Wonderful Adornment in the age of the Buddha Cloud Thunder Roll King. She became Bodhisattva Wonderful Voice by virtue of venerating the Lotus Sūtra. When Śākyamuni Buddha expounded the Lotus Sūtra in the Sahā World, she came and promised that she would protect all women who upheld the Lotus Sūtra in the Latter Age of Degeneration.

Nichinyo Gozen Gohenji, Response to My Lady Nichinyo, Writings of Nichiren Shōnin, Faith and Practice, Volume 4, Page 133