Amago Tsunehisa

Who They Were

Amago Tsunehisa (尼子経久, あまご つねひさ) was a daimyo of the Muromachi period (1336–1573), born on December 25, 1458, in Izumo Province. He rose from the position of a vassal under the Rokkaku clan to become the dominant warlord of the Chūgoku region, the western end of Japan's main island of Honshu. By the 1520s, he controlled eleven domains: Inaba, Hōki, Izumo, Iwami, Oki, Harima, Mimasaka, Bizen, Bitchū, Bingo, and Aki.

Tsunehisa was the eldest son of Amago Kiyosada. His childhood name was Matashiro (又四郎). He died on November 30, 1541, from illness, at the age of 82.

Life and Career

In 1473, Tsunehisa served as his father's deputy, handling negotiations with the Rokkaku clan over taxation of goods passing through Amago territory. He became deputy governor of Izumo Province in 1477 and received the character Kei (経) in his name from Governor Kyogoku Masatsune, a mark of formal recognition. In 1484, the Muromachi Ashikaga clan expelled him from his position.

Two years later, Tsunehisa returned. With fewer than one hundred troops, he seized Tomidajo, the stronghold of the Rokkaku clan. This dramatic recovery re-established his authority. Over the following decades, he methodically subjugated the powerful regional clans of Izumo, known as kokujin (国人), and by 1508 he had gained full control of the province.

In that same year, Ōuchi Yoshioki marched on Kyoto to support Ashikaga Yoshitada. With Yoshioki distracted far to the east, Tsunehisa secretly communicated with kokujin across the Chūgoku region, building a network to counter the powerful Ōuchi clan. The rivalry between Amago and Ōuchi defined the region's politics for years.

In 1513, Tsunehisa lost his eldest son and heir apparent, Amago Masahisa, who died fighting Sakurai Masamune. Despite this personal blow, Tsunehisa pressed on and by the 1520s had succeeded in controlling all eleven domains. Samurai in Iwami and Aki were forced to walk a tightrope between the two great houses. Mōri Motonari, who would eventually destroy both Amago and Ōuchi, was one such samurai navigating that precarious balance.

Tsunehisa's late years were troubled by internal strife. In 1532, at the age of 74, he was forced to crush a revolt led by his own third son, Amago Okihisa. The rebellion left him without a clear heir. In 1538, he handed leadership of the Amago clan to his grandson, Amago Haruhisa. Three years later, Tsunehisa died from illness, worried that young Haruhisa might be too inexperienced to hold the clan's territories together.

Why They Matter

Tsunehisa built one of the most powerful regional states of the late Muromachi period from a single provincial base. His seizure of Tomidajo with fewer than one hundred men became a defining example of tactical boldness in samurai warfare. His eleven-domain hegemony made the Amago clan the principal rival to the Ōuchi clan, and the two houses' struggle shaped the political landscape of western Honshu for decades.

His career also illustrates the fluid loyalties of the age. Tsunehisa was expelled by the Ashikaga shogunate, returned by force, and then spent years cultivating alliances with local kokujin against a larger enemy. The same network of regional samurai that he built up would later abandon his grandson, and Mōri Motonari—once forced to balance between Amago and Ōuchi—would ultimately absorb the Amago domains. Tsunehisa's rise and fall set the stage for that transition.

The Name in Japanese

The name is 尼子経久, read in kana as あまご つねひさ, and in romaji as Amago Tsunehisa.

• 尼 (あま, ama): "nun." This character is used phonetically in the surname and carries no religious meaning here.
• 子 (こ, ko): "child." Together with 尼, it forms the surname 尼子, Amago, a name of uncertain origin but likely tied to a local place or clan tradition.
• 経 (つね, tsune): "pass through; longitude; sutra." In this given name, it is read tsune and means "constant" or "enduring." Tsunehisa received this character from Governor Kyogoku Masatsune in 1477 as a mark of his appointment.
• 久 (ひさ, hisa): "long time; long-lasting." The compound 経久, Tsunehisa, thus carries the sense of "enduring and long-lasting," a fitting name for a warlord who spent decades consolidating power.

The surname 尼子 is written with two characters, while the given name 経久 uses two more. In Japanese naming convention, the surname comes first, so the full name is 尼子経久.

Legacy

Tsunehisa's burial name is 興国院月叟省心大居士, and he is buried at Dokoji temple in Shimane Prefecture. His grandson Amago Haruhisa inherited the clan in 1538 but could not sustain the hegemony Tsunehisa had built. Within a generation, the Amago clan fell to Mōri Motonari, the very samurai who had once walked the tightrope between Amago and Ōuchi.

Tsunehisa's legacy endures in the historical record as a model of the self-made warlord: expelled, returned, and risen through a combination of military daring and political patience. His eleven-domain state was the high-water mark of Amago power, and his story remains central to the history of the Chūgoku region in the late Muromachi period.