Okudaira Tadamasa

Who They Were

Okudaira Tadamasa (奥平忠政, おくだいら ただまさ) was a samurai and daimyō of the Azuchi–Momoyama period, born in 1580 and dead on 7 August 1614. He was the son of Okudaira Nobumasa and Kame-hime, a daughter of Tokugawa Ieyasu. That maternal line placed Tadamasa inside the Tokugawa family's innermost circle at the moment the Tokugawa were consolidating national power, and it shaped nearly everything about his short career.

He held the title of daimyō — a regional lord who governed a domain and maintained a military following — and he succeeded his father as lord of the Kanō Domain. He was born in Tenshō 天正 (てんしょう) 8, the eighth year of an era name that ran from 1573 to 1592.

Life and Career

Tadamasa was born in 1580 to Okudaira Nobumasa and Kame-hime. His mother was a daughter of Tokugawa Ieyasu, which made Tadamasa Ieyasu's grandson. The Okudaira had earned that marriage through hard service: Nobumasa held the castle at Nagashino for the Tokugawa against a far larger Takeda assault, and Ieyasu rewarded him with a daughter and with trust.

At some point in his childhood, Tadamasa was adopted by Suganuma Sadamitsu. The arrangement lasted only five years before it was dissolved, and Tadamasa returned to the Okudaira line. Adoption of this kind was a standard instrument of alliance and inheritance planning among warrior houses; a five-year placement that ended suggests the political calculation behind it changed.

Because of his Tokugawa descent, Tadamasa was permitted to use the Matsudaira surname. Matsudaira was the Tokugawa family's ancestral name, and permission to bear it was a mark of exceptional standing — a signal that the bearer belonged to the ruling house's extended kin rather than to the ordinary warrior aristocracy.

On Nobumasa's death, Tadamasa succeeded him as lord of the Kanō Domain. He did not hold that position long. He died on 7 August 1614, at the age of thirty-four, and was succeeded in turn by his son, Okudaira Tadataka.

Why They Matter

Tadamasa's significance lies less in what he did than in what he was. He stood at the junction of two warrior houses — the Okudaira, who had staked their survival on loyalty to the Tokugawa at Nagashino, and the Tokugawa themselves, who by the early seventeenth century were the ruling power of Japan. His right to call himself Matsudaira made that junction visible in his own name.

His life also illustrates how the Tokugawa consolidated authority after 1600: through marriage, adoption, surname grants, and the orderly transfer of domains between generations. Tadamasa inherited Kanō not by conquest but by being the correct son of the correct father and the correct grandson of Ieyasu.

He died in 1614, the year the Tokugawa besieged Osaka Castle and eliminated the last serious military opposition to their rule. He did not live to see the settlement that followed, but his family's position was already secured within it.

The Name in Japanese

The full name is written 奥平忠政. It is read おくだいら ただまさ in kana, and rendered in romaji as Okudaira Tadamasa. The family name comes first, as is standard in Japanese; the given name follows.

奥 (おく) — "inner," "deep," or "interior." In this name it carries the sense of something recessed or profound. It is the first element of the surname.

平 (だいら) — "flat," "level," or "peace." Read alone it is usually taira or hira; inside this surname it takes the voiced form daira. The same character appears in the far more famous surname Taira (平), the clan that fought the Minamoto in the twelfth century, though here it functions purely as part of the Okudaira name.

Together, 奥平 (おくだいら) is the surname. The Okudaira were a warrior house of Mikawa province, the region that produced the Tokugawa themselves.

忠 (ただ) — "loyalty," "devotion," "faithfulness." This is the first element of the given name, and it is a heavily favoured character in warrior naming: it announces the virtue a lord most wanted to see in a son. Read in this name it is tada.

政 (まさ) — "government," "rule," "administration," or "politics." It is the second element of the given name, read masa. Combined with 忠, the name 忠政 (ただまさ) can be read as something like "loyal governance" — a fitting name for a boy raised to inherit a domain.

The name as a whole, then, breaks down as: surname 奥平 (Okudaira) plus given name 忠政 (Tadamasa). Note that 忠 and 政 both carry meanings tied to duty and rule, which is typical of samurai given names of this period. A reader who learns to spot 忠 in a warrior's name will find it again and again across the Edo period.

Legacy

Tadamasa's direct legacy was the continuation of the Okudaira house through his son, Okudaira Tadataka, who succeeded him at Kanō in 1614. The family line he represented carried forward the reputation the Okudaira had built at Nagashino and the kinship tie to the Tokugawa that his mother's marriage had created.

He is remembered chiefly as a Tokugawa grandchild who became a domain lord and died young, in the same year the Tokugawa destroyed their last great rival. His name survives in the record of the Okudaira house and in the genealogies of the Tokugawa kin network — a small but precise marker of how the early Edo order was built out of marriages, adoptions, and inherited names.