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 of the sixth century. 816: Kūkai founds . One of the major schools of Buddhism in Japan today and one of the few surviving Vajrayana lineages in East Asia, it originally spread from India to China through traveling monks such as Vajrabodhi and Amoghavajra. Known in Chinese as the Tangmi, these esoteric teachings would flourish in Japan under the auspices of a Buddhist monk named , who traveled to Tang China in 804 as part of the same expedition as Saichō. In the capital he studied Tangmi and Sanskrit and received initiation from Huiguo. On returning to Japan, Kūkai eventually