Located at about 450 meters above sea level, Taisanji is the first of the bangai temples on the Shikoku pilgrimage known commonly as Ohenro, and the first of the 36 temples on the Shikoku Fudo Myo O pilgrimage. Most pilgrims on the Ohenro don't make the steep detour up to it, as I didn't when I walked it, , but I was on my first day of the Fudo pilgrimage.
According to the legend it is a very ancient holy spot for Buddhism being established in the 6th Century. Later the monk Gyoki, who is credited with founding many of the Ohenro temples, practised austerities here, and later still Kobo Daishi came here and built a building and put a statue of Senju Kannon here. It is said he received the statue from his master when studying in China.
There was a giant, ancient Gingko tree in the grounds but the leaves had all fallen. I had passed through some fall colors on the way up the mountain but at this height it had all gone. I had become intrigued by Taisanji after reading a little about Tachikawa Ryu, a school of Shingon that espoused a type of tantric practise utilizing sexual energy, and Taisanji was one of its centers. It became outlawed and actually classed as heresy by the head authorities of Shingon so all records were destroyed or locked away.
Of course there was no sign of it anywhere I could see.