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 when King Seong of Baekje (聖明王, now western Korea) sent a mission to the Emperor Kinmei that included Buddhist monks or nuns together with an image of Buddha and a number of sutras to introduce Buddhism. The powerful Soga clan played a key role in the early spread of Buddhism in the country. Initial uptake of the new faith was slow, and Buddhism only started to spread some years later when Empress Suiko openly encouraged the acceptance of Buddhism among all Japanese people. According to legend, in Japan in 552, there was an attempt to destroy a tooth relic, one