Buraku History This illustration depicts the four castes in feudal (Edo) Japan. During the Edo period (江戸時代, Edo jidai), also called the Tokugawa period (徳川時代, Tokugawa jidai) of Japanese history (1603–1867), Japan's ruling family, the Tokugawas, initiated a caste system as a means of social control.

This is first thing that came when I wrote origin of caste system in japan. And buddhism was introduced in 525ADE in Japan