The "Three Great Teachers"

"The false doctrines propagated by the Three Great Teachers are in general disseminated from three places: To-ji, Soji-in on Mount Hiei, and Onjo-ji. If measures are not taken to prohibit the activities of these three temples, then without a doubt the nation will be destroyed and its people will fall into the evil paths. Although I generally discerned the nature of the situation and informed the ruler, no one has ventured to make the slightest use of my advice. How pitiable! (On The Four Stages of Faith and Five Stages of Practice)

Today it is the false doctrines of the "Three Great Teachers" of Taisekeji, Shinanomachi, and Minobu that will destroy the nation [of Japan].