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 Bhutan to benefit the spirits of the dead. To help propagate the faith, itinerant monks travel from village to village carrying portable shrines with many small doors, which open to reveal statues and images of the Buddha, bodhisattavas, and notable lamas. Before the introduction of Buddhism, Bön religion was prevalent in Bhutan. Imported from Tibet and India, perhaps in the eighth century, Bön doctrine became so strongly reinvigorated by Buddhism that by the eleventh and twelfth century it reasserted itself as an independent school apart from Buddhism. Bön continues to be practiced in modern Bhutan. Buddhism in Bhutan Buddhism is the