Yonekura Masakata

Who They Were

Yonekura Masakata (米倉昌賢) was a daimyō — a territorial lord, from the Japanese 大名, だいみょう — of the Edo period, which ran from 1603 to 1868. He ruled Mutsuura Domain, a small holding in the southern part of Musashi Province on the main island of Honshū. That territory corresponds to modern-day Kanazawa-ku, a ward of Yokohama in Kanagawa Prefecture. He was the fourth lord of Mutsuura and the seventh head of the Yonekura clan.

He was born on July 21, 1758, in the eighth year of the Hōreki era (宝暦, ほうれき), and died on August 5, 1798, at the age of forty. His father was Yonekura Masaharu. Like other lords of his rank, he held a courtesy title at the imperial court, Nagato-no-kami, a post associated with the province of Nagato.

Life and Career

Masakata was born into the Yonekura clan in 1758, the son of Yonekura Masaharu. The Yonekura were a daimyō house whose fortunes were tied to Mutsuura Domain, a coastal territory on the western shore of Edo Bay. By the time of Masakata's birth, the domain had passed through three previous lords, and the family had established itself as a minor but durable presence in the political landscape of the Kantō region.

He became the fourth lord of Mutsuura and the seventh head of the clan. In the Edo period's political order, a daimyō's standing was measured in part by the assessed yield of his domain, and Mutsuura was a small domain — the kind of holding whose lord attended the shogun's court in Edo, performed assigned duties, and managed a compact territory and its samurai retainers. The title Nagato-no-kami marked his court rank and was used in formal documents and ceremonial contexts rather than in everyday speech.

Masakata's life spanned the middle decades of the eighteenth century, a period of relative stability under the Tokugawa shogunate. He died on August 5, 1798, in the tenth year of the Kansei era, having led the domain and the clan until his death at forty.

Why They Matter

Masakata belongs to the long roll of Edo-period daimyō whose importance lies less in dramatic deeds than in the structure they upheld. The Tokugawa system depended on thousands of lords like him: men who governed defined territories, maintained samurai retainers, and answered to the shogunate in Edo. Mutsuura Domain's position in southern Musashi placed it within the political and economic orbit of Edo, the shogunal capital, and its lords were part of the dense network of obligation and ceremony that kept the regime functioning.

For the history of the Yonekura clan, Masakata's tenure as seventh head and fourth lord marks a link in an unbroken line of succession. Genealogies of daimyō houses like this one are among the primary records through which historians reconstruct how power was transmitted in early modern Japan — by inheritance, adoption, and shogunal confirmation rather than by open competition. His dated birth and death, his parentage, and his court title are the fixed points from which that reconstruction proceeds.

The Name in Japanese

The name is written 米倉昌賢. It is read in kana as よねくら まさかた, and rendered in romaji as Yonekura Masakata. The family name comes first, as is standard in Japanese; the given name follows.

Breaking the name down character by character:

米 (read よね, yone) — "rice." The character depicts grains of rice and is one of the most basic agricultural terms in the language. In this name it forms the first element of the surname.

倉 (read くら, kura) — "storehouse," "granary," "warehouse." Combined with the previous character, 米倉 suggests a rice storehouse — an apt name for a family whose status rested on the assessed rice yield of its domain. Together, 米倉 is read よねくら, Yonekura.

昌 (read まさ, masa) — "prosperous," "flourishing," "bright." This is a common element in male given names of the Edo period, chosen for its auspicious sense of growth and success.

賢 (read かた, kata) — "wise," "intelligent," "virtuous." The final character completes the given name 昌賢, read まさかた, Masakata. The pairing of 昌 and 賢 gives a name meaning something like "flourishing wisdom."

Note that the readings まさ and かた for these characters are name-specific readings (nanori), not the readings the characters carry in ordinary vocabulary. A learner encountering 昌 or 賢 in a dictionary will find different readings listed first; the values here apply to this name.

Legacy

Masakata's legacy is bound up with the continuity of the Yonekura clan and Mutsuura Domain. He died in 1798, and the lordship passed on within the family line, as daimyō succession required. The domain itself, seated in what is now Kanazawa-ku in Yokohama, left its traces in the place names and local history of the area, though the political world it belonged to ended with the Meiji Restoration of 1868, when the Tokugawa order was dismantled and the domains were abolished in favour of prefectures.

What survives of Masakata in the record is precise but narrow: a birth date, a death date, a father's name, a domain, a court title, and a position in a family genealogy. For students of Japanese history and language, that is enough to anchor him in time and place — a daimyō of the mid-Edo period, the fourth of his line at Mutsuura, and the seventh head of the Yonekura clan.