Iyo Province, Historical province in northwestern Shikoku, Japan
Iyo was a historical province in northwestern Shikoku, spanning coastal areas and mountainous valleys. The region bordered Sanuki to the northeast, Awa to the east, and Tosa to the south.
The province was established during the eighth-century Ritsuryō reforms as part of Japan's administrative reorganization. In the tenth century, it became the stage for pirate rebellions led by Fujiwara no Sumitomo, who operated from the coast.
The name Iyo comes from an old word meaning "hidden," reflecting the province's position tucked behind mountains on Shikoku's northwestern coast. Travelers today can still see how valleys and steep slopes shaped local settlement patterns and kept communities apart.
The former province corresponds roughly to modern Ehime Prefecture, though some borders have shifted over time. Travelers will find the best remnants of old administrative structures around Imabari and on Ōmishima island.
The Ōyamazumi Shrine on Ōmishima holds one of the largest collections of preserved samurai armor in Japan. The island served for centuries as a spiritual center for warriors who prayed there for protection before battles.
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