Izumo Province

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Izumo (Japanese: 出雲国; Izumo no kuni) was an old province of Japan which today consists of the eastern part of Shimane prefecture in the Chūgoku region. The origin of the word Izumo is from the name of the goddess Izanami. She is the mother of Japan and buried on Mt. Hiba, at the border of the old provinces of Izumo and Hoki, near modern-day Yasugi of Shimane Prefecture.

It was one of the regions of ancient Japan where major political powers arose. A powerful clan of Izumo (Idumo is an obsolete romanization) constituted an independent polity, but during the fourth century BC it was absorbed due to the expansion of the state of Yamato, within which it assumed the role of a sacerdotal domain. Even today the Izumo Shrine constitutes (as does the Grand Shrine of Ise) one of the more important sacred places of Shinto: it is dedicated to kami, especially to Ōkuninushi (Ō-kuni-nushi-no-mikoto), mythical progeny of Susanoo and all the clans of Izumo.

By the Sengoku period, Izumo had lost much of its importance. It was dominated before the Battle of Sekigahara by the Mori clan, and after, Sekigahara was an independent fief with a castle town at modern Matsue.