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 priests, and 569 Buddhist nuns in Japan. The initial period saw the six great Chinese schools, called in Japanese were introduced to the Japanese archipelago: These schools were centered around the ancient capitals of Asuka and Nara, where great temples such as the Asuka-dera and Tōdai-ji were erected respectively. These were not exclusive schools, and temples were apt to have scholars versed in several of the schools. It has been suggested that they can best be thought of as "study groups". The Buddhism of these periods, known as the Asuka period and Nara period – was not a practical religion,