Daihōon-ji  Daihōon-ji (大報恩寺) is a Buddhist temple in Kamigyō-ku, Kyoto, Japan. It is affiliated with Shingon-shū Chizan-ha Buddhism. Its or is a National Treasure of Japan. Daihōon-ji was founded by Guhou Shōnin (求法上人), also known as Gikuu (義空) in 1221, the early Kamakura period. The main hall was constructed around 1227 and fortunately escaped the destruction in the Ōnin War. Hondō is the oldest wooden building in existence in Kyoto city.