Obata Masamori

Who They Were

Obata Masamori (小幡昌盛) was a samurai commander of the Sengoku period, the long century and a half of near-constant civil war that tore Japan apart between the collapse of central authority in the fifteenth century and the reunification of the country around 1600. He served the Takeda house, the warrior clan that dominated the mountainous province of Kai in central Honshu, and he is remembered above all as one of the "Twenty-Four Generals of Takeda Shingen" — a group of senior retainers singled out in later tradition as the finest battlefield commanders their lord possessed.

Masamori was born in 1534, in the third year of the Tenbun era (天文), and died on 29 March 1582. His life therefore spans almost exactly the decades in which the Takeda clan rose to its greatest power and then collapsed. He was the son of Obata Toramori, and the father of Obata Kagenori, a scholar-warrior who would become far better known to later generations than Masamori himself.

Life and Career

The Obata were a warrior family of the region around Kai, and Masamori inherited his position within it from his father, Obata Toramori. Service to the Takeda was the family's defining commitment, and Masamori's career was built entirely inside that structure. He appears in the historical record as a mounted commander and castle-holder rather than as an administrator or a courtier — a man whose standing rested on military performance in an age when that was the only currency that mattered.

His reputation was made in the Takeda campaigns of the 1550s through the 1570s, the period in which Takeda Shingen expanded out of Kai into the surrounding provinces and fought his celebrated rivalries with the Uesugi of Echigo and the Hōjō of the Kantō plain. Commanders of Masamori's rank led contingents of cavalry and foot soldiers, held frontier castles, and were expected to hold ground against numerically superior enemies. The label "Twenty-Four Generals of Takeda Shingen" is a later grouping rather than a formal office, but it reflects a real distinction: these were the men Shingen trusted with independent command.

Masamori outlived his lord. Takeda Shingen died in 1573, and the leadership of the clan passed to his son Takeda Katsuyori. Under Katsuyori the Takeda fought on against Oda Nobunaga, the warlord then consolidating control of central Japan. The end came in 1582, when Nobunaga's forces destroyed the Takeda. Masamori died on 29 March 1582, in the same collapse that extinguished the house he had served his whole life.

Why They Matter

Obata Masamori matters for two reasons, one military and one genealogical.

Militarily, he belongs to the class of retainers who made the Takeda army one of the most feared fighting forces of sixteenth-century Japan. The Takeda were famous for their cavalry and for the discipline of their provincial administration, and both depended on men like Masamori who could hold a border castle and lead a contingent without supervision. The "Twenty-Four Generals" tradition preserves their names precisely because the Takeda system could not function without them.

Genealogically, Masamori is the link in a chain of three generations of Obata warriors: his father Toramori before him, and his son Kagenori after him. Kagenori became a retainer of the Tokugawa, the dynasty that would rule Japan from 1603 to 1868, and a respected military scholar. The fact that the Obata name survived the annihilation of the Takeda in 1582 is due to Masamori's son — and to Masamori himself, who gave that son his standing.

The Name in Japanese

The full name is written 小幡昌盛. It is read in kana as おばた まさもり, and rendered in romaji as Obata Masamori. The family name comes first, as is standard in Japanese; the given name follows.

小幡 (おばた, Obata) — the family name, written with two kanji:

• 小 — read here as o. It means "small" or "little." It is one of the most common elements in Japanese place names and surnames.
• 幡 — read here as bata (a voiced form of hata). It means "banner," "flag," or "pennant" — specifically the kind of cloth standard carried into battle. A warrior family named "small banner" carries its military identity in its own name.

昌盛 (まさもり, Masamori) — the given name, also written with two kanji:

• 昌 — read here as masa. It means "prosperous," "flourishing," or "bright." It is a common element in samurai given names of this period, chosen for its auspicious force.
• 盛 — read here as mori. It means "prosperous," "thriving," or "abundant," and also carries the sense of something at its peak. Paired with 昌, the two characters reinforce each other: the name as a whole means something like "flourishing and abundant."

The name is thus built from a martial surname and an auspicious given name — a very typical construction for a sixteenth-century warrior. Note that the kanji 盛 also appears in the names of many of Masamori's contemporaries, which makes it a useful character to recognise when reading Sengoku-period sources.

Legacy

Masamori's direct legacy is his son, Obata Kagenori, who carried the family into the service of the Tokugawa and into the long peace of the Edo period. Through Kagenori, the Obata survived the destruction of the Takeda in 1582 and became part of the warrior establishment of unified Japan.

His indirect legacy is the "Twenty-Four Generals of Takeda Shingen" tradition itself. The grouping is a later construct, but it has proved remarkably durable, and it is the reason Masamori's name is still recognised today. To be listed among the twenty-four is to be remembered as one of the men who made the Takeda army work — and for a samurai who died in the same year his clan did, that is a considerable afterlife.