was an old province of Japan

Japan

Japan is an island nation in East Asia. Located in the Pacific Ocean, it lies to the east of the Sea of Japan, China, North Korea, South Korea and Russia, stretching from the Sea of Okhotsk in the north to the East China Sea and Taiwan in the south...

 which today consists of the eastern part of Shimane Prefecture

Shimane Prefecture

is a prefecture of Japan located in the Chūgoku region on Honshū island. The capital is Matsue. It is the second least populous prefecture in Japan, after its eastern neighbor Tottori. The prefecture has an area elongated from east to west facing the Chūgoku Mountain Range on the south side and to...

. It was sometimes called . The province is in the Chūgoku Region

Chugoku region

The , also known as the , is the westernmost region of Honshū, the largest island of Japan. It consists of the prefectures of Hiroshima, Okayama, Shimane, Tottori and Yamaguchi. It has a population of about 7.8 million.- History :...

.

History

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

Yamato Province

was a province of Japan, located in Kinai, corresponding to present-day Nara Prefecture in Honshū. It was also called . At first, the name was written with one different character , and for about ten years after 737, this was revised to use more desirable characters . The final revision was made in...

, 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

Shinto

or Shintoism, also kami-no-michi, is the indigenous spirituality of Japan and the Japanese people. It is a set of practices, to be carried out diligently, to establish a connection between present day Japan and its ancient past. Shinto practices were first recorded and codified in the written...

: it is dedicated to kami

Kami

is the Japanese word for the spirits, natural forces, or essence in the Shinto faith. Although the word is sometimes translated as "god" or "deity", some Shinto scholars argue that such a translation can cause a misunderstanding of the term...

, especially to Ōkuninushi (Ō-kuni-nushi-no-mikoto), mythical progeny of Susa-no-Ō

Susanoo

, also known as is the Shinto god of the sea and storms. He is also considered to be ruler of Yomi.-Myths:In Japanese mythology, Susanoo, the powerful storm of Summer, is the brother of Amaterasu, the goddess of the sun, and of Tsukuyomi, the god of the moon. All three were born from Izanagi, when...

 and all the clans of Izumo. The mythological mother of Japan, the goddess Izanami

Izanami

In Japanese mythology, is a goddess of both creation and death, as well as the former wife of the god Izanagi-no-Mikoto. She is also referred to as Izanami-no-kami.-Goddess of Creation:...

, is said to be buried on Mt. Hiba, at the border of the old provinces of Izumo and Hōki

Hoki Province

was an old province of Japan in the area that is today the western part of Tottori Prefecture. It was sometimes called . Hōki bordered on Inaba, Mimasaka, Bitchū, Bingo, and Izumo Provinces....

, near modern-day Yasugi of Shimane Prefecture

Shimane Prefecture

is a prefecture of Japan located in the Chūgoku region on Honshū island. The capital is Matsue. It is the second least populous prefecture in Japan, after its eastern neighbor Tottori. The prefecture has an area elongated from east to west facing the Chūgoku Mountain Range on the south side and to...

.

By the Sengoku Period

Sengoku period

The or Warring States period in Japanese history was a time of social upheaval, political intrigue, and nearly constant military conflict that lasted roughly from the middle of the 15th century to the beginning of the 17th century. The name "Sengoku" was adopted by Japanese historians in reference...

, Izumo had lost much of its importance. It was dominated before the Battle of Sekigahara

Battle of Sekigahara

The , popularly known as the , was a decisive battle on October 21, 1600 which cleared the path to the Shogunate for Tokugawa Ieyasu...

 by the Mori clan

Mori clan

The Mōri clan was a family of daimyō, descended from Ōe no Hiromoto and established themselves in Aki Province. Their name was derived from a shōen in Mōri, Aikō District, Sagami Province. The generation of Hiromoto began to name themselves Mōri.After the Jōkyū War, Mōri was appointed to the jitō...

, and after Sekigahara, it was an independent fief with a castle town at modern Matsue

Matsue, Shimane

is the capital city of Shimane Prefecture in the Chūgoku region of Japan.As of August, 2011, the city has an estimated population of 207,000, following its most recent merging with Higashi-Izumo...

.

In Japanese mythology, the entrance to Yomi

Yomi

, the Japanese word for the underworld in which horrible creatures guard the exits; according to Shinto mythology as related in Kojiki, this is where the dead go to dwell and apparently rot indefinitely. Once one has eaten at the hearth of Yomi it is impossible to return to the land of the living...

 (Hell, land of the dead) was located within the province, and was sealed by the god Izanagi

Izanagi

is a deity born of the seven divine generations in Japanese mythology and Shinto, and is also referred to in the roughly translated Kojiki as "male-who-invites" or Izanagi-no-mikoto. It is also pronounced Izanaki-no-Okami....

by placing a large boulder over the entrance.