History of Japan men instead joined forces with Emperor Go-Daigo and overthrew the Kamakura shogunate. Japan nevertheless entered a period of prosperity and population growth starting around 1250. In rural areas, the greater use of iron tools and fertilizer, improved irrigation techniques, and double-cropping increased productivity and rural villages grew. Fewer famines and epidemics allowed cities to grow and commerce to boom. Buddhism, which had been largely a religion of the elites, was brought to the masses by prominent monks, such as Hōnen (1133–1212), who established Pure Land Buddhism in Japan, and Nichiren (1222–82), who founded Nichiren Buddhism. Zen Buddhism spread widely among
Buddhism in Japan which had become a strong political and military force in Japan. Neo-Confucianism and Shinto gained influence at the expense of Buddhism, which came under strict state control. Japan closed itself off to the rest of the world. The only traders to be allowed were Dutchmen admitted to the island of Dejima. New doctrines and methods were not to be introduced, nor were new temples and schools. The only exception was the Ōbaku lineage, which was introduced in the 17th century during the Edo period by Ingen, a Chinese monk. Ingen had been a member of the Linji school, the Chinese