also known as was a Japanese

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 ...

warrior of the

Sengoku period The was a period in History of Japan, Japanese history of near-constant civil war and social upheaval from 1467 to 1615. The Sengoku period was initiated by the Ōnin War in 1467 which collapsed the Feudalism, feudal system of Japan under the ...

. He was known as one of the "

Twenty-Four Generals of Takeda Shingen 24 (twenty-four) is the natural number following 23 and preceding 25. The SI prefix for 1024 is yotta (Y), and for 10−24 (i.e., the reciprocal of 1024) yocto (y). These numbers are the largest and smallest number to receive an SI prefix to d ...

". He is often credited as the original author of ''

Kōyō Gunkan The is a record of the military exploits of the Takeda family, compiled largely by the Takeda vassal Kōsaka Danjō Masanobu, and completed in 1616 by Obata Kagenori. It provides some of the most detailed descriptions and statistics of warf ...

'', which records the history of the

Takeda family The was a Japanese samurai clan active from the late Heian period until the late 16th century. The clan was historically based in Kai Province in present-day Yamanashi Prefecture. The clan reached its greatest influence under the rule of Taked ...

and their military tactics.

Biography

Kōsaka is known as one of the three "Danjō" that served the Takeda family, along with

Sanada Yukitaka was a Japanese samurai warrior of the Sengoku period. He is known as one of the "Twenty-Four Generals of Takeda Shingen". He was the father of Sanada Nobutsuna and Sanada Masayuki and grandfather of the legendary samurai warrior Sanada Yuk ...

and

Hoshina Masatoshi (1509–1593) was a Japanese samurai of the Sengoku period, who served the Takeda clan. He was the head of Hoshina clan, son of Hoshina Masanori. Masatoshi served under Shingen from the latter's earliest campaigns and fought in many of battles. ...

(Danjō stands for a formal title, Danjōchū; 弾正忠). Among these three, Kōsaka was known as the "Nige Danjō" (逃げ弾正; literally, the fleeing Danjō), because of his cautious commanding and skillful retreats. In 1561, as the general in command of

Kaizu Kiso Sansen Park Center is a city located in Gifu, Japan. , the city had an estimated population of 34,960, and a population density of 310 persons per km2, in 12,167 households. The total area of the city was . Most of the city is located at sea ...

castle, Kōsaka played an important role in the fourth

Battle of Kawanakajima The were a series of battles fought in the Sengoku period of Japan between Takeda Shingen of Kai Province and Uesugi Kenshin of Echigo Province from 1553 to 1564. Shingen and Kenshin contested each other for control of the plain of Kawanakaj ...

. He informed Takeda via signal fires of the movements of

Uesugi Kenshin , later known as was a Japanese ''daimyō''. He was born in Nagao clan, and after adoption into the Uesugi clan, ruled Echigo Province in the Sengoku period of Japan. He was one of the most powerful ''daimyō'' of the Sengoku period. Known a ...

's army as it approached, and then led the sneak attack up Saijo-yama in order to drive Uesugi's men down to the plain where they could be surprised by Takeda's army. Even though that tactic failed, Kōsaka led his men back down the hill, attacking Uesugi's army from the rear, turning the tide of the battle. In 1575, he led troops to protect

Takeda Katsuyori was a Japanese ''daimyō'' of the Sengoku period, who was famed as the head of the Takeda clan and the successor to the legendary warlord Takeda Shingen. He was son in law of Hojo Ujiyasu. Early life He was the son of Shingen by the daughter ...

's rearguard at

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 taki ...

when the latter had been forced to retreat by the Oda-Tokugawa alliance.

Relationship with Shingen

The association between Masanobu and Shingen began in 1543 as a love relationship. At the time they were 16 and 22, respectively. Such relationships were in vogue in pre-modern Japan, a tradition known as shudo. The love pact signed by the two, in

University of Tokyo , abbreviated as or UTokyo, is a public research university located in Bunkyō, Tokyo, Japan. Established in 1877, the university was the first Imperial University and is currently a Top Type university of the Top Global University Project by ...

's Historical Archive, documents Shingen's pledge that he was not in, nor had any intentions of entering into, a sexual relationship with a certain other retainer, and asserts that "since I want to be intimate with you" he will in no way harm the boy, and calls upon the gods to be his guarantors. (Leupp, pp. 53–54)

Retirement and death

Kōsaka Masanobu is known to have openly criticized Katsuyori numerous times. Because of this, Kosaka was forced to "retire" from service in 1578 and died later from illness.

References

External links

"Legendary Takeda's 24 Generals" at Yamanashi-kankou.jp
{{DEFAULTSORT:Kosaka, Masanobu 1527 births 1578 deaths Samurai Takeda retainers 16th-century LGBT people LGBT people from Japan Gay military personnel

Biography

Relationship with Shingen

Retirement and death

References

Further reading

External links