Iino Hachimangu Shrine

Iino Hachimangu Shrine is situated in the Taira district of Iwaki, Fukushima Prefecture, north of the former Iwaki Castle. The principal enshrined kami (shusaijin) is Honden-waki-no-Mikoto, also known as the Emperor Ōjin—the fifteenth sovereign according to the *Kojiki* (Records of Ancient Matters, 712 CE), born during the campaigns of the Empress Jingū. The shrine follows the standard liturgical form of the eight-kami triad: the principal deity, the Empress Jingū (enshrined as Okinagatarashi-Hime-no-Mikoto), and the Hime-no-Kami (the three goddesses of Munakata, according to some traditions).

The shrine precincts encompass approximately 10,000 square metres. Eight structures—the main hall (honden), tower gate, veil hall, worship hall (haiden), sacred-dance hall, and three ancillary buildings—are designated as Important Cultural Properties of Japan. Dating from the Kamakura through Muromachi periods, they represent a significant architectural ensemble. The shrine precincts themselves are designated as a National Historic Site.

According to shrine tradition, the shrine was founded in 1186 when Minamoto no Yoritomo transferred a branch spirit (bunrei) of the Tsurugaoka Hachimangu Shrine to Iwaki, establishing it as a tutelary shrine for the samurai class. In 1334, the Iwasaki clan relocated the shrine to its present location, where it became the clan deity (ujigami) of the Iwaki clan during the Muromachi period.

The principal structural elements date to distinct periods: the main hall (honden) was built in 1334; the tower gate, veil hall, and worship hall were reconstructed in 1611. In 1999, eight structures were collectively designated as Important Cultural Properties. The shrine precincts were designated a National Historic Site in 2008.

The primary annual observance is the autumn festival (*matsuri*) on 14–15 September, which includes a divine procession through the old castle town. Monthly observances occur on the 15th of each month. These rites continue the traditions of Hachiman worship in Mutsu.