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 630 and introduced to Japan in 654 by Dōshō, who had travelled to China to study under him. The is an important text for the Hossō school. This school was transmitted to Japan in the 7th century. Literally: "Three-Discourse School"; a Madhyamaka school which developed in China based on two discourses by Nagarjuna and one by Aryadeva. Madhyamaka is one of the two most important Mahayana philosophies, and reemphasizes the original Buddhist teachings that phenomena are neither truly existent or absolutely non-existent, but are characterized by impermanence and insubstantiality. 736: Bodhisena introduces the Kegon (Huayan or Avataṃsaka) school to Japan.