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Myōkō-Togakushi Renzan NP, Nagano
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Local lore links Iizuna’s name to “rice sand,” a barley-like soil once said to be edible near the summit. Scientists’ documented Tengu-no-mugimeshi microbial mats come from the Asama-Eboshi region, so Iizuna’s edible-soil story is a tradition—not a trail snack.
Uesugi Kenshin wore an image of Iizuna’s deity on his helmet, while his rival Takeda Shingen carried the deity’s image and ritual text. The mountain’s god became a shared battlefield guardian for two famously opposed warlords.
Iizuna’s tengu-like deity, usually shown riding a white fox, did not remain local: Tokyo’s Takao-san Yakuō-in enshrines Izuna Daigongen as its principal image. There, the deity is described as a striking blend of 5 divine figures.
Iizuna’s summit is part of the rim of a collapsed volcano. The mountain may once have reached 2,400–2,500 m; a huge collapse left a horseshoe-shaped caldera, with today’s 1,917 m summit on its outer rim.
On the southern approach, 13 stone Buddhist figures line the way toward Iizuna Shrine’s summit sanctuary. Nagano’s official tourism site dates this trail-side group to about 180 years ago—quiet companions on a route once used for mountain worship.
Iizuna’s spiritual community was led by the Sennichi Tayū, a hereditary line of lay ascetics who oversaw the mountain and its practitioners. An Iizuna Jizō image made in 1369 already bears the Sennichi Tayū title.
Near 1,600–1,700 m, Iizuna’s summit slopes open into a flower meadow that looks alpine, though it lies in the subalpine zone. Heavy snow and strong winds keep trees at bay; about 800 wild plant species grow across the mountain and Iizuna Highlands.
One of the earliest historical references to Mount Iizuna appears in a text dated 1279, where the mountain figures in the legendary origins of Togakushi-dera. Iizuna’s mountain worship was first recorded in a story linking it with its famous neighbor.
A medieval Togakushi account gives Iizuna Gongen an unusual rank: in the legend, the deity calls himself Japan’s “third tengu” and seeks help to become a proper god. It is a religious origin story, not a historical ranking.
