Shijō Kingo visited Nichiren Daishonin on Sado Island in the fourth month of the ninth year of Bun’ei (1272), and the Daishonin entrusted him with this letter for his wife, Nichigen-nyo, who was a devoted follower of the Daishonin’s teachings. Nichigen-nyo was the name given to her by the Daishonin. He also named her two daughters, Tsukimaro and Kyō’ō. First, the Daishonin urges Nichigen-nyo to read the letter with Tōshirō’s wife. While little is known of Tōshirō and his wife, it is believed that he was one of Kingo’s colleagues in the Kamakura government. In the feudalistic society of the time, life was difficult for women since their social status was invariably inferior to that of men. Nevertheless, though she had no one else to rely on, Nichigen-nyo sent her husband all the way from Kamakura to Sado on a journey that was both difficult and dangerous. For this the Daishonin highly praises her faith. https://www.nichirenlibrary.org/en/wnd-1/Content/34