Udono Nagateru

Who They Were

Udono Nagateru (鵜殿長照) was a samurai commander of the Sengoku period, the era of warring states that ran from the mid-fifteenth to the late sixteenth century. He belonged to the Udono clan and served the Imagawa house, one of the great warrior families of central Japan. He held Kaminogō Castle in Mikawa Province, a region that corresponds roughly to the eastern half of modern Aichi Prefecture.

His standing within the Imagawa was personal as well as political. He was a nephew of Imagawa Yoshimoto, the head of the clan and one of the most powerful lords of his generation. That blood tie placed Nagateru among the senior retainers of a house that, at its height, controlled Suruga, Tōtōmi and Mikawa provinces and threatened the road to the capital at Kyoto.

His father was Udono Nagamochi. His mother was a daughter of Imagawa Ujizane's line — more precisely, a daughter of Imagawa Ujichika, which made her Yoshimoto's sister. She later became the wife of Udono Nagamochi, binding the Udono firmly into the Imagawa family network. Nagateru himself had a son, Udono Ujinaga, who carried the clan name into the following generation.

Life and Career

Nagateru's career is defined by two battles fought two years apart, both against the same enemy: Oda Nobunaga.

In 1560, Imagawa Yoshimoto marched west at the head of a large army, aiming to break through to Kyoto. Nagateru fought in that campaign at the Battle of Okehazama, where Nobunaga's far smaller force caught the Imagawa column in a sudden downpour and killed Yoshimoto. The defeat shattered Imagawa authority and left the clan's eastern borders exposed. Nagateru survived the disaster, but the world it had belonged to did not.

The collapse of Imagawa power opened Mikawa to Tokugawa Ieyasu, who had been a hostage of the Imagawa in his youth and now moved to take the province for himself. In 1562 Ieyasu attacked Kaminogō Castle, Nagateru's stronghold. The Siege of Kaminogō Castle ended with Nagateru dead, killed by Ieyasu's forces on 8 March 1562.

The aftermath shaped the politics of the region. Nagateru's family was taken hostage, and Ieyasu used them as leverage to secure the release of his own wife and son, who were being held by the Imagawa. The exchange of captives that followed removed a standing obstacle to Ieyasu's consolidation of Mikawa, and the Udono line continued under his authority through Nagateru's son Ujinaga.

Why They Matter

Nagateru's significance is not that he won great victories — he did not. It lies in what his death made possible.

Kaminogō Castle was one of the last Imagawa footholds in Mikawa. When it fell and its lord was killed, Ieyasu gained both the territory and the hostages he needed to settle accounts with the Imagawa on his own terms. The recovery of his wife and son freed him from a constraint that had limited his freedom of action for years. From that point, Ieyasu was able to govern Mikawa as a secure base, and Mikawa became the foundation of everything he built afterward.

Nagateru also stands as a representative of the Imagawa collapse. In 1560 the house was dominant; by 1562 one of its castles in Mikawa had fallen and a kinsman of Yoshimoto was dead. The speed of that reversal is one of the striking features of the period, and Nagateru's career traces it in miniature: he fought at the battle that broke the Imagawa, and he died in the follow-up campaign that finished the job in the east.

The Name in Japanese

The full name is written 鵜殿長照. It is read in kana as うどの ながてる, and in romaji as Udono Nagateru. The family name comes first, as is standard in Japanese; the given name follows.

Broken down character by character:

鵜 — read u here. It means "cormorant," the diving seabird used in traditional Japanese fishing. It is a relatively uncommon character in surnames.

殿 — read dono here. It means "hall," "palace," or "lord's residence," and it is also the honorific suffix attached to a samurai's name. As the second element of a surname it carries the sense of a great house or estate.

Together, 鵜殿 (Udono) is a place-name surname: a family taking its name from a locality, as most warrior clans did.

長 — read naga here. It means "long" or "chief," and it is a very common element in samurai given names, often signalling seniority or precedence within a family.

照 — read teru here. It means "to shine," "to illuminate," or "to reflect light." It appears frequently in warrior names of the period, sometimes as an element granted by a superior as a mark of favour.

So the given name 長照 (Nagateru) combines "long/chief" with "shine" — a conventional and dignified samurai name rather than a descriptive phrase. Note that the same character 長 is read naga in this name but chō in many other contexts, and 照 is read teru here; kanji readings in Japanese names are fixed by convention and cannot be predicted from the characters alone.

Legacy

The Udono name did not disappear with Nagateru. His son, Udono Ujinaga, survived the fall of Kaminogō and continued the line, now as a retainer of the Tokugawa rather than the Imagawa. The clan's fortunes were thus transferred, along with Mikawa itself, from one overlord to another.

Nagateru's death belongs to the sequence of events by which the Imagawa were displaced and the Tokugawa rose. He is remembered chiefly in that context: as the lord of Kaminogō Castle, as a kinsman of Imagawa Yoshimoto, and as one of the men whose defeat cleared the way for Tokugawa Ieyasu's consolidation of Mikawa. His grave and the site of his castle are associated with the campaigns of 1562, and his name appears in accounts of the Siege of Kaminogō Castle and the hostage exchange that followed it.