Amago Kunihisa

Who They Were

Amago Kunihisa (尼子国久, あまご くにひさ) was a samurai commander and daimyo of the Sengoku period, the long century and a half of civil war that tore Japan apart between the collapse of central authority and the reunification of the country under Tokugawa Ieyasu. He was born in 1492, the first year of the Meiō era (明応), and died on 25 November 1554. He was a son of Amago Tsunehisa, the man who built the Amago clan into the dominant power of western Honshu, and he served as one of his father's principal generals.

Kunihisa's personal following became known as the Shingūtō (新宮党), the "Shingū faction", named after the town of Shingū where he built his residence, in a valley north-east of the Amago stronghold at Gassan-Toda. The Shingūtō functioned as a private army within the wider Amago war machine, and its reputation for ferocity was such that Tsunehisa described his son's grasp of military matters in the strongest terms available to him: like a kami and an oni, a god and a demon.

Life and Career

Kunihisa fought under his father through the 1520s in campaigns across Aki and Bingo provinces, the region facing the Inland Sea that would later become the heartland of the Mōri clan. In 1540 he took the field alongside his nephew Amago Haruhisa at the Siege of Koriyama Castle, one of the defining confrontations of the Amago–Mōri struggle for control of western Japan. Four years later, in 1544, he defeated a Mōri army in the field.

That run of success carried a price. At the Battle of Hashizugawa in 1546, fought against Takeda Kuninobu of Inaba Province, Kunihisa's second son Toyohisa was killed in one of the bitterest engagements of the campaign. Kunihisa had already taken on a role beyond that of a field commander: when Amago Masahisa died in 1518, Kunihisa acted as guardian to Masahisa's son Haruhisa, the boy who would eventually inherit leadership of the clan.

Kunihisa's temperament worked against him. He was contemptuous of men who performed poorly in battle, and his manner was often overbearing. As the Shingūtō's fame grew, so did its arrogance, and the faction's standing at the Amago court became a source of friction rather than strength. After Tsunehisa's death, Haruhisa — now daimyo and Kunihisa's nephew — came to distrust his old guardian.

The end came on 25 November 1554. Haruhisa had Kunihisa killed on suspicion of treason, together with Kunihisa's eldest son Sanehisa and two grandsons, along with a number of his retainers. Kunihisa's third son Takehisa killed himself the following day. The Mōri daimyo Mōri Motonari was said to have tricked Haruhisa into believing that Kunihisa meant to seize control of the Amago clan; Kunihisa's persistent arrogance toward the young Haruhisa may have been reason enough on its own.

Why They Matter

The purge of 1554 was one of the most self-destructive acts any Sengoku daimyo committed. Kunihisa was not a marginal figure. He was a proven commander, the head of a battle-hardened faction, and the guardian who had steered Haruhisa into his inheritance. By eliminating him, his heir, his grandsons and much of the Shingūtō in a single stroke, Haruhisa removed a large share of the Amago clan's experienced military leadership.

The consequences unfolded over the following two decades. The Amago clan, already locked in a long contest with the Mōri, was significantly weakened by the loss, and the damage contributed to its eventual fall to the Mōri in the 1570s. Kunihisa's death is therefore one of the clearest examples in the period of a daimyo destroying his own best asset out of suspicion — and paying for it with the survival of his house.

The Name in Japanese

The full name is written 尼子国久, read in kana as あまご くにひさ, and romanised as Amago Kunihisa. The family name comes first, as is standard in Japanese.

尼 (あま, ama) — a Buddhist nun. The character depicts a person beside a religious structure. It is the first element of the Amago surname.

子 (ご, go) — child. In this surname the character is read go rather than the more familiar ko, the reading used in everyday words for "child". Together, 尼子 is a place-derived surname associated with the Amago clan of Izumo Province.

国 (くに, kuni) — country, province, or territory. This is the first element of his given name, and it is a common component in the names of samurai of this era, where a single character was often inherited from a senior clan figure.

久 (ひさ, hisa) — long-lasting, enduring, of long duration. It appears in the given names of several members of Kunihisa's immediate family, including his father Tsunehisa (経久) and his son Sanehisa (誠久), which is typical of the way Sengoku families reused characters across generations.

The name as a whole is thus a surname of place and a given name built from two auspicious characters, "province" and "enduring". Readers will also encounter the surname spelled Amako in older English-language writing; both renderings represent the same 尼子.

Legacy

Kunihisa's memory survives chiefly through the manner of his death. The destruction of the Shingūtō in 1554 became a byword in later accounts of the period for the danger a talented subordinate posed to a nervous overlord, and for the cost of a purge carried out on suspicion rather than proof.

His descendants were not entirely extinguished. Among his children recorded in the historical record are his eldest son Sanehisa, killed alongside him; his second son Toyohisa, who fell at Hashizugawa in 1546; his third son Takehisa, who took his own life the day after his father's death; and his son Amago Takahisa. Two of his daughters are remembered through their marriages, one to Yuhara Nobutsuna and one to Shinji Tsuneyoshi. Through these marriages and surviving lines, the family name persisted beyond the catastrophe that ended Kunihisa's own career.