Kosoku-ji Temple

"Kosokuji Temple (literally 'light gauging temple') is associated with the 13th century priest Nichiren, the fierce asserter of the Lotus Sutra against all other forms of Buddhism during the Kamakura shogunate period of Japanese history. Kosokuji began life as an ordinary residence until the owner, Mitsunori Yadoya, was landed with five disciples of Nichiren, who had been exiled to Sado Island off the coast of what is now Niigata Prefecture. The Kamakura shogunate commanded Mitsunori Yadoya to keep them securely confined in a dungeon on his property (still visible behind the cemetery at the north of the temple grounds). One of men to be kept in detention was Nichiren's chief disciple, Nichiro (1243-1320)."