Buddhism in Japan began teaching devotion to the "Lotus Sutra". Eventually, his disciples formed their own school of Nichiren Buddhism, which includes various sects that have their own interpretations of Nichiren's teachings. Nichiren Buddhism established the foundation of Japanese Buddhism in the thirteenth century. The school is known for its sociopolitical activism and looks to reform society through faith. In the Muromachi period, Zen, particularly the Rinzai school, obtained the help of the Ashikaga shogunate and the Emperor of Japan, and accomplished considerable development. After the Sengoku period of war, Japan was re-united in the Azuchi–Momoyama period. This decreased the power of Buddhism,
Buddhism in Japan "Shibunritsu" (四分律) The was one of the six schools of Buddhism introduced to Japan during the Asuka and Nara periods. Along with the and the Risshū, it is a school of Nikaya Buddhism, which is sometimes derisively known to Mahayana Buddhism as "the Hinayana". A Sarvastivada school, Kusha-shū focussed on abhidharma analysis based on the by the fourth-century Gandharan philosopher Vasubandhu. The school takes its name from that authoritative text. 807: Saichō introduces the Tendai (Tiantai) school to Japan. Known as Tiantai (天台) in China, the Tendai school was founded by Zhiyi (智顗, Jp "Chigi") in China, c. 550. In