Emperor Tenmu's 675 meat-eating decree
In 675 CE Emperor Tenmu, influenced by Buddhist doctrine against taking life, banned eating cattle, horses, dogs, monkeys and chickens from the fourth to the ninth month, the rice-growing season. The ban left out deer and wild boar, the most commonly hunted game, so it was aimed at protecting draft animals and the rice harvest rather than removing meat from the diet. Later decrees and Shinto ideas of pollution (kegare) hardened it into a broad avoidance of meat. That avoidance was officially reversed only in 1872, when it was publicized that the Meiji Emperor ate beef as part of Westernization.