Jimon's head temple was Miidera, at the foot of Mount Hiei, while the Sammon sect was based at Enryakuji, at the summit of the mountain. This rivalry does not appear to be based on differing opinions on dogma or doctrine, only a sort of jealousy, each seeking to be the chief or sole Tendai core temple. Following the deaths of Enchin in 891, this rivalry only deepened, and over the next several centuries, led to a number of armed conflicts. Most were the result of a monk from one faction becoming appointed Abbot (zasu) of the other faction's temple, or of one faction not being invited to events, conferences, or festivals held by the other.
As the disagreements escalated into armed conflicts, both sects formed the first standing armies of warrior monks, called sohei. When the Genpei War broke out in 1180, the warrior monks of the two sects found themselves on opposing sides, the Enryakuji Sammon monks supporting the Taira clan while Miidera's Jimon monks supported the Minamoto clan.
Only after the end of the Genpei War and the establishment of the first shogunate did the conflicts between the two sects settle down. However, the division and disagreement lasted several centuries longer, until both temples were destroyed by the forces of Oda Nobunaga at the end of the 16th century. Though it is unclear when the names 'Jimon' and 'Sammon' fell out of use, and when the two temples ceased fighting, the destruction of both temples by a greater, larger outside force brought a definite end to their quarrels.
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