Minamoto no Masanobu

Who They Were

Minamoto no Masanobu (源雅信, みなもと まさざね) was a court noble of the Heian period, the era that ran from 794 to 1185 and in which the Japanese imperial court at Kyoto produced most of the literature, poetry and political intrigue that later ages looked back on as classical Japan. He lived from 920 to 993, dying on 19 August 993. Though catalogued as a samurai, his world was the aristocratic court rather than the battlefield: he was a kugyō (公卿, くぎょう), a noble of the highest court rank, one of the small circle of men who advised the emperor and ran the government.

He was the third son of Imperial Prince Atsumi, a son of Emperor Uda, which placed him in the imperial bloodline but outside the immediate succession. His mother was a daughter of Fujiwara no Tokihira, one of the most powerful statesmen of the previous generation. Through his father he founded the Uda Genji, one of the several Genji or "Minamoto" branches created when emperors and princes removed their descendants from the imperial family and gave them a surname and a court career.

Life and Career

Masanobu's rise was steady and institutional. In 978 he became Minister of the Left (左大臣, さだいじん), the senior of the two great ministers of state below the regent, a post that made him one of the two or three most important men at court. He held that standing in the closing decades of the tenth century, a period when the Fujiwara family was consolidating its grip on the throne through marriage: a Fujiwara daughter would bear the emperor's heir, and the Fujiwara father would govern as regent.

Masanobu's own household became part of that system, but not by his design. His daughter Rinshi married Fujiwara no Michinaga at a time when Michinaga held a comparatively low position at court. Masanobu initially objected to the match precisely because of Michinaga's rank. His wife Bokushi argued for the marriage and carried the point. Michinaga went on to become regent, and Bokushi's judgement was vindicated. Michinaga frequented Masanobu's residence, known as Tsuchimikado-dono (土御門殿, つちみかどどの), and the house became a centre of the political world.

Masanobu's wives were Fujiwara no Bokushi, a daughter of Fujiwara no Motokata, a woman known as Shinden no Ue, and a daughter of Minamoto no Kimichū. Among his children were Minamoto no Sukenori, Minamoto no Tokimichi, Minamoto no Tokikata, Minamoto no Tokinaka, Minamoto no Rinshi, a son named Saijin who became a monk under the name Jakugen, and daughters including one who married the imperial prince Munehira, and Naka no Kimi.

Why They Matter

Two things give Masanobu his place in the record. The first is the Uda Genji: he is named as the progenitor of that lineage, the Minamoto house descended from Emperor Uda. The Genji name carried enormous prestige in later centuries, and tracing a family to a ninth- or tenth-century prince was how warrior clans of the medieval period claimed courtly ancestry.

The second is the marriage of his daughter Rinshi to Fujiwara no Michinaga. Michinaga became the dominant figure of his age, the regent whose daughters married emperors and whose authority exceeded that of any subject before him. The alliance was made when Michinaga was still far from that height, and Masanobu's reluctance, overridden by Bokushi, is remembered as a case of a mother reading the political future more accurately than a cautious father. Tsuchimikado-dono, the house where Michinaga came and went, stands in the record as one of the addresses where the politics of the era were conducted.

The Name in Japanese

The name is written 源雅信. In kana it is みなもと まさざね, and in romaji it is Minamoto no Masazane — the reading given here follows the kana, though the same characters are also read Masanobu. The particle の (no) between the family name and the personal name is the classical possessive marker, meaning roughly "of": Minamoto of [the line of] Masazane.

Breaking it down character by character:

• 源 — read minamoto here. It means "source", "origin" or "fountainhead". As a surname it is the character granted to princes and their descendants when they left the imperial family and took commoner noble status. Several such clans were founded, distinguished by the emperor they descended from: the Uda Genji, the Saga Genji, the Seiwa Genji and others. The same character is read gen in the compound Genji (源氏), literally "the Minamoto clan".
• 雅 — read masa here. It means "elegant", "refined", "correct" or "graceful". It is a very common element in Heian aristocratic male names, chosen for its connotations of courtly cultivation rather than for any literal reference.
• 信 — read zane here (the underlying reading is nobu, voiced to zane in this combination). It means "trust", "faith", "belief" or "truth". Like 雅, it is a stock element in names of the period; the same character appears in the names of Masanobu's own sons, Tokinaka and Tokikata, and in countless courtiers of the era.

So the full name means, very loosely, "the Minamoto of the source, [personal name] Masa-zane" — a surname marking descent from an emperor, plus a two-character given name built from words for elegance and trustworthiness. This pattern, a clan name plus の plus a two-kanji given name, is the standard shape of a Heian nobleman's name, and recognising it makes the dense genealogies of the period far easier to read.

Legacy

Masanobu's line, the Uda Genji, carried his name forward as a descent group, and his position as Minister of the Left placed him among the senior statesmen of the late tenth century. His most consequential act was not an office but a marriage: the union of his daughter Rinshi with Fujiwara no Michinaga tied the Uda Genji to the family that would dominate the court for generations. The residence Tsuchimikado-dono, where Michinaga was a frequent visitor, remained associated with the family's standing. Masanobu died on 19 August 993, having seen his daughter's husband begin the ascent that would make him the most powerful regent in Japanese history.