calamity of revolt within one’s own domain ［自界叛逆難］ ( jikai-hongyaku-nan): Also, internal strife. One of the seven disasters described in the Medicine Master Sutra. In On Establishing the Correct Teaching for the Peace of the Land, written in 1260, Nichiren predicted that this and the calamity of invasion from foreign lands would occur if the rulers of Japan failed to accept the correct teaching. His prediction of internal strife was realized when a revolt took place within the ruling Hōjō clan. In the second month of 1272, Hōjō Tokisuke revolted against his younger half brother, the regent Hōjō Tokimune, in an attempt to seize power. See also seven disasters.