Mōri clan in the context of "Daimyō"

The Chōshū Domain (長州藩, Chōshū-han), also known as the Hagi Domain (萩藩, Hagi-han), was a domain (han) of the Tokugawa Shogunate of Japan during the Edo period from 1600 to 1871.

The Chōshū Domain was based at Hagi Castle in Nagato Province, in the modern city of Hagi, located in the Chūgoku region of the island of Honshu. The Chōshū Domain was ruled for its existence by the tozama daimyō of the Mōri, whose branches also ruled the neighboring Chōfu and Kiyosue domains and was assessed under the Kokudaka system with peak value of 369,000 koku. The Chōshū Domain was the most prominent anti-Tokugawa domain and formed the Satchō Alliance with the rival Satsuma Domain during the Meiji Restoration, becoming instrumental in the establishment of the Empire of Japan and the Meiji oligarchy. The Chōshū Domain was dissolved in the abolition of the han system in 1871 by the Meiji government and its territory was absorbed into Yamaguchi Prefecture.

Mōri Motonari (毛利 元就; April 16, 1497 – July 6, 1571) was a prominent daimyō (feudal lord) in the western Chūgoku region of Japan during the Sengoku period of the 16th century. The Mōri clan claimed descent from Ōe no Hiromoto (大江広元), an adviser to Minamoto no Yoritomo. Motonari was called the "Beggar Prince". He was known as a great strategist who began as a small local warlord (jizamurai) of Aki Province and extended his clan's power to nearly all of the Chūgoku region through war, marriage, adoption and assassination.

Sandwiched between the powerful Amago and Ōuchi clans, Motonari led his clan by carefully balancing actions and diplomacy. Eventually, Motonari succeeded in defeating both and controlled the entire Chūgoku region. In his later years, he crushed the Ōtomo clan of Bungo Province in Kyūshū. Motonari ruled from Yoshida-Kōriyama Castle, the clan's main bastion since the early 14th century. His descendants became lords of the Chōshū Domain.

Azuchi Castle (安土城, Azuchi-jō) was one of the primary castles of Oda Nobunaga located in the Azuchi neighborhood of the city of Ōmihachiman, Shiga Prefecture. The site of the castle was designated a National Historic Site in 1926, with the designation upgraded to that of a Special National Historic Site in 1952. The castle is located within the grounds of the Biwako Quasi-National Park.

Azuchi Castle was built from 1576 to 1579 on Mount Azuchi on the eastern shore of Lake Biwa in Ōmi Province. Nobunaga intentionally built Azuchi Castle close enough to Kyoto that he could watch over and guard the approaches to the capital, but outside Kyoto so his fortress would be immune to the fires and conflicts that occasionally consumed the city. Azuchi Castle's location was also strategically advantageous in managing the communications and transportation routes between Nobunaga's greatest foes – the Uesugi to the north, the Takeda in the east, and the Mōri to the west. Azuchi Castle was demolished in 1582 by Akechi Mitsuhide after his assassination of Nobunaga in the Honno-ji Incident.

Hagi Castle (萩城, Hagi-jō) is a Japanese castle located in the city of Hagi, Yamaguchi Prefecture, in the San'yō region of Japan. Built in 1604 at the beginning of the Edo period as the main castle of the Mōri clan, it served as the seat of the Chōshū Domain for over 250 years until 1863. It was demolished in 1874 shortly after the Meiji Restoration. Its ruins were designated a National Historic Site in 1924. Hagi Castle has been designed as a component of the Sites of Japan's Meiji Industrial Revolution: Iron and Steel, Shipbuilding and Coal Mining, which received UNESCO World Heritage Site status in 2015.

Chōfu Domain (長府藩, Chōfu-han) was a feudal domain under the Tokugawa shogunate of Edo period Japan, in what is now part of Shimonoseki, Yamaguchi Prefecture. It was centered around Kushizaki Castle and was ruled throughout its history by a cadet branch of the Mōri clan. Chōfu Domain was dissolved in the abolition of the han system in 1871. The domain was also called Nagato-Chōfu Domain (長門長府藩, Nagato-Chōfu-han) or Nagato-Fuchū Domain (長門府中藩, Nagato-Fuchū-han).

The Kiyosue Domain (清末藩, Kiyosue-han) was a Japanese domain of the Edo period, located in Nagato Province. It was ruled for the entirety of its history by a branch of the Mōri clan of the neighboring Chōshū Domain.

Ōuchi clan (大内氏, Ōuchi-shi) was one of the most powerful and important families in Western Japan during the reign of the Ashikaga shogunate in the 14th to 16th centuries. Their domains, ruled from the castle town of Yamaguchi in the western tip of Honshu island, comprised six provinces at their height, and the Ōuchi played a major role in supporting the Ashikaga in the Nanboku-cho Wars against the Southern Imperial Court. The Ōuchi remained powerful up until the 1550s, when they were eclipsed by their former vassals, the Mōri clan.