Nichijun ［日順］ (1294–1356): A disciple of Nikkō, Nichiren’s successor. Born in Kai Province, Japan, he became a disciple of Nitchō (1262–1310) in his boyhood. Nitchō was originally a disciple of Nikō, one of the six senior priests designated by Nichiren. After Nikō violated a number of Nichiren’s teachings and refused to support Nikkō, whom Nichiren had designated as his successor, Nitchō left Nikō to become Nikkō’s disciple, and Nichijun followed suit. Around 1317 he was appointed the chief instructor of Omosu Seminary, a position formerly held by Nitchō. In 1327, representing Nikkō, he went to Kyoto and submitted a letter of remonstration to the imperial court urging the court to accept Nichiren’s teachings. In 1328, under Nikkō’s direction, he wrote On Refuting the Five Priests, pointing out the errors made by five of the six senior priests. In 1329 he was afflicted with an eye disease. He eventually lost sight in one eye and went to live in retirement in Ōsawa in Kai Province. In obedience to Nikkō’s last wishes, however, he again began to lecture on Nichiren’s writings at Omosu Seminary after Nikkō’s death. He left a number of works, including commentaries on The Selection of the Time and The Opening of the Eyes.