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 ...

and feudal lord (''

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

'') of the

Muromachi period The is a division of Japanese history running from approximately 1336 to 1573. The period marks the governance of the Muromachi or Ashikaga shogunate (''Muromachi bakufu'' or ''Ashikaga bakufu''), which was officially established in 1338 by t ...

(early 15th century), who is most known for his rivalry with

Hatakeyama Masanaga was a ''daimyō'' of the Hatakeyama clan and, according to some accounts, invented the '' horo'', a stiffened cloak used by messengers and bodyguards to improve their visibility on the battlefield, and to act as an arrow-catcher. Masanaga is mos ...

over the position of

Kanrei or, more rarely, ''kanryō'', was a high political post in feudal Japan; it is usually translated as ''shōguns deputy''. After 1349, there were actually two ''Kanrei'', the ''Kyoto Kanrei'' and the ''Kantō Kanrei''. Originally, from 1219 until ...

, or Shōgun's Deputy. This rivalry grew out of the larger conflict between

Hosokawa Katsumoto was one of the Kanrei, the Deputies to the Shōgun, during Japan's Muromachi period. He is famous for his involvement in the creation of Ryōan-ji, a temple famous for its rock garden, and for his involvement in the Ōnin War, which sparked the 1 ...

and

Yamana Sōzen was originally before becoming a monk. Due to his red complexion, he was sometimes known as ''Aka-nyūdō'', "the Red Monk". He was one of the ''daimyōs'' who fought against Hosokawa Katsumoto during the Ōnin War in Heian-kyō. Biography Yam ...

, which escalated into the

Ōnin War The , also known as the Upheaval of Ōnin and Ōnin-Bunmei war, was a civil war that lasted from 1467 to 1477, during the Muromachi period in Japan. ''Ōnin'' refers to the Japanese era during which the war started; the war ended during the Bunmei ...

. Masanaga and Yoshinari were largely stalemated for much of this period, as Yamana and Hosokawa Katsumoto warned that the first to engage in battle within the capital would be declared a rebel. Becoming a "rebel" meant losing alliances as well as honor.

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