was ''

daimyō were powerful Japanese magnates, feudal lords who, from the 10th century to the early Meiji period in the middle 19th century, ruled most of Japan from their vast, hereditary land holdings. They were subordinate to the shogun and nominal ...

'' of

Odawara Domain 250px, Odawara Castle, Headquarters of the Odawara Domain was a Japanese domain of the Edo period, located primarily in western Sagami Province (modern-day Kanagawa Prefecture). It was centered on Odawara Castle in what is now the city of Oda ...

Sagami Province was a province of Japan located in what is today the central and western Kanagawa Prefecture. Nussbaum, Louis-Frédéric. (2005). "''Kanagawa''" at . Sagami Province bordered the provinces of Izu, Musashi, and Suruga. It had access to the Pac ...

in early

Edo period The or is the period between 1603 and 1867 in the history of Japan, when Japan was under the rule of the Tokugawa shogunate and the country's 300 regional '' daimyo''. Emerging from the chaos of the Sengoku period, the Edo period was characte ...

, Japan. Ōkubo Tadachika was the son of

Ōkubo Tadayo was a samurai general in the service of Tokugawa Ieyasu in the Azuchi–Momoyama period, subsequently becoming a ''Daimyō'' of Odawara Domain in early Edo period, Japan. Biography Ōkubo Tadayo was the eldest son of Ōkubo Tadakazu, a her ...

, a hereditary vassal to the

Tokugawa clan The is a Japanese dynasty that was formerly a powerful ''daimyō'' family. They nominally descended from Emperor Seiwa (850–880) and were a branch of the Minamoto clan (Seiwa Genji) through the Matsudaira clan. The early history of this clan r ...

in what is now part of the city of

Okazaki, Aichi is a city located in Aichi Prefecture, Japan. , the city had an estimated population of 386,999 in 164,087 households, and a population density of 999 persons per km². The total area of the city was . Geography Okazaki is in the coastal plains o ...

. He entered into service as a

samurai were the hereditary military nobility and officer caste of medieval and early-modern Japan from the late 12th century until their abolition in 1876. They were the well-paid retainers of the '' daimyo'' (the great feudal landholders). They h ...

from age 11, and took his first head in battle at the age of 16. He served in most of the campaigns of his father, including the

Battle of Anegawa The Sengoku period (30 July 1570) occurred near Lake Biwa in Ōmi Province, Japan, between the allied forces of Oda Nobunaga and Tokugawa Ieyasu, against the combined forces of the Azai and Asakura clans._It_is_notable_as_the_first_battle ...

(1570), Battle of Mikatagahara (1573),

Battle of Nagashino The took place in 1575 near Nagashino Castle on the plain of Shitaragahara in the Mikawa Province of Japan. Takeda Katsuyori attacked the castle when Okudaira Sadamasa rejoined the Tokugawa, and when his original plot with Oga Yashiro for t ...

(1575),

Battle of Komaki and Nagakute The was a series of battles in 1584 between the forces of Hashiba Hideyoshi (who would become Toyotomi Hideyoshi in 1586) and the forces of Oda Nobukatsu and Tokugawa Ieyasu. Hideyoshi and Ieyasu had both served Oda Nobunaga and had not previou ...

(1584), and Battle of Odawara (1590). He came to be regarded as one of Ieyasu's most experienced and trusted advisors, along with

Honda Masanobu was a commander and ''daimyō'' in the service of Tokugawa Ieyasu in Japan during the Azuchi-Momoyama and Edo periods. In 1563, when an uprising against Ieyasu occurred in Mikawa Province, Masanobu took the side of the peasants against Ieyasu ...

. In 1593, he was assigned the post of

Karō were top-ranking samurai officials and advisors in service to the ''daimyōs'' of feudal Japan. Overview In the Edo period, the policy of ''sankin-kōtai'' (alternate attendance) required each ''daimyō'' to place a ''karō'' in Edo and anothe ...

Tokugawa Hidetada was the second ''shōgun'' of the Tokugawa dynasty, who ruled from 1605 until his abdication in 1623. He was the third son of Tokugawa Ieyasu, the first ''shōgun'' of the Tokugawa shogunate. Early life (1579–1593) Tokugawa Hidetada was bo ...

. Upon the death of his father in 1594, he became head of the

Ōkubo clan The were a ''samurai'' kin group which rose to prominence in the Sengoku period and the Edo periods.Meyer, Eva-Maria"Gouverneure von Kyôto in der Edo-Zeit."Universität Tübingen (in German) Under the Tokugawa shogunate, the Ōkubo, as heredita ...

, and daimyō of Odawara Domain, whose revenues were raised to 65,000 '' koku.'' During the Battle of Sekigahara, his forces accompanied those of Tokugawa Hidetada along the

Nakasendō The , also called the ,Richard Lane, ''Images from the Floating World'' (1978) Chartwell, Secaucus ; pg. 285 was one of the five routes of the Edo period, and one of the two that connected Edo (modern-day Tokyo) to Kyoto in Japan. There were 69 ...

, and were late in arriving at the battle due to resistance by

Sanada Masayuki was a Japanese Sengoku period lord and ''daimyō''. He was the head of Sanada clan,_a_regional_house_of_Shinano_Province.html" ;"title="DF 56 of 80/nowiki>">DF 56 of 80">("S ..., a regional house of Shinano Province">DF 56 of 80/nowiki>">DF 56 ...

Ueda Castle is a Japanese castle located in Ueda, northern Nagano Prefecture, Japan. At the end of the Edo period, Ueda Castle was home to a cadet branch of the Matsudaira clan, ''daimyō'' of Ueda Domain, but the castle is better known for its association ...

in Shinano Province. In 1610, after the foundation of the

Tokugawa shogunate The Tokugawa shogunate (, Japanese 徳川幕府 ''Tokugawa bakufu''), also known as the , was the military government of Japan during the Edo period from 1603 to 1868. Nussbaum, Louis-Frédéric. (2005)"''Tokugawa-jidai''"in ''Japan Encyclopedia ...

, he became a ''

rōjū The , usually translated as ''Elder'', was one of the highest-ranking government posts under the Tokugawa shogunate of Edo period Japan. The term refers either to individual Elders, or to the Council of Elders as a whole; under the first two ''shō ...

''. This was a period of great political intrigue, as

Tokugawa Ieyasu was the founder and first ''shōgun'' of the Tokugawa Shogunate of Japan, which ruled Japan from 1603 until the Meiji Restoration in 1868. He was one of the three "Great Unifiers" of Japan, along with his former lord Oda Nobunaga and fello ...

had retired to Sunpu, but continued to manipulate politics from behind-the-scenes, much to the growing discontent of Hidedata and his retainers. Ōkubo Tadachika fell afoul of the shogunate in what was later termed the Ōkubo Nagayasu Incident of 1614. His domain was confiscated, and he was reassigned to a small 5,000 ''koku'' ''

hatamoto A was a high ranking samurai in the direct service of the Tokugawa shogunate of feudal Japan. While all three of the shogunates in Japanese history had official retainers, in the two preceding ones, they were referred to as '' gokenin.'' Howev ...

'' holding in

Ōmi Province was a province of Japan, which today comprises Shiga Prefecture. It was one of the provinces that made up the Tōsandō circuit. Its nickname is . Under the '' Engishiki'' classification system, Ōmi was ranked as one of the 13 "great countr ...

. Shortly afterwards, he retired from public life, became a Buddhist monk by the name of Keian Dōhaku (渓庵道白).

References

* Japanese Wikipedia article on Tadachika (21 Sept. 2007)

References

Further reading