Further, the Emperor was deeply connected with Buddhism until the Edo period, and until 1871, there were mortuary tablets of the successive Emperors in Kokudo-no-ma (room with a black door) in the Imperial court.
また、江戸時代までは仏教とも深く繋がっており、明治４年までは宮中の黒戸の間に仏壇があり、歴代天皇の位牌があった。