Shimonoseki, Yamaguchi in the context of Battle of Dan-no-ura

The Battle of Dan-no-ura (壇ノ浦の戦い, Dan-no-ura no tatakai) was a major sea battle of the Genpei War, occurring at Dan-no-ura, in the Shimonoseki Strait off the southern tip of Honshū. On April 25, 1185 (or March 24, 1185 by the official page of Shimonoseki City), the fleet of the Minamoto clan (Genji), led by general Minamoto no Yoshitsune, defeated the fleet of the Taira clan (Heike). The morning rip tide was an advantage for the Taira, but turned to their disadvantage in the afternoon. The young Emperor Antoku was one of those who died among the Taira nobles.

The Kinzan Kōzan-ji (金山功山寺) is a temple of the Sōtō school of Zen faction in Shimonoseki, Yamaguchi Prefecture, Japan. It was first established as a temple of the Rinzai school by Kyoan Genjaku in 1327 of the late Kamakura era.

Kōzan-ji's Butsuden, completed in 1320, is a National Treasure of Japan. This architecture in Zenshūyō (禅宗様) (aka Zen'yō) style (Zen style), combining Japanese and Chinese Buddhist design features. It is the oldest building designed in the Zenshūyō style that exists in Japan.