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,
History of Buddhism in Cambodia to Shiva, with whom they continued to be identified by hereditary families of priests. Rajendravarman II studied Buddhism intensely." The Sailendra dynasty also built the fantastic Mahayana Buddhist temple Borobudur (750-850) in Java. Borobudur appears to have been the inspiration for the later fabulous Angkor building projects in Cambodia, particularly Angkor Wat and Angkor Thom. The primary form of Buddhism practiced in Cambodia during Angkor times was Mahayana Buddhism, strongly influenced with Tantric tendencies. "The prevalence of Tantrayana in Java, Sumatra and Kamboja [Cambodia], a fact now definitely established by modern researches into the character of Mahayana Buddhism and Sivaism