Ennin built a Monju (Manjusri) statue with a piece of fragrant wood that he found when he climbed the North peak called Beitai Ding or Yedou Feng (3058m) of Mt. Wutai (China); after returning to Japan, he built a pavilion for the statue at Enryaku-ji Temple in November 861 (the original pavilion was burnt down by Nobunaga ODA's fire attack against Mt. Hiei [1571] and the current one was re-built) and next to Ennin's Monjusuri pavilion, there is a monument in honor to the memory of Bogo JANG.
円仁は五台山(中国)の一つ北台葉頭峰（3058メートル）に登頂した際に手に入れた香木で文殊像を造り、帰国実現ののち861年（貞観(日本)3年）10月、延暦寺に文殊楼を建立（織田信長の比叡山焼き討ち(1571年)で焼亡。現在の文殊楼は再建したもの）したが、この円仁の延暦寺文殊楼脇には張保皐顕彰碑が建てられている。