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'Uesugi Kagekatsu' (上杉 景勝, January 8 1556-March 19 1623) was a daimyo during the Sengoku and Edo periods of Japanese history. The son of Nagao Masakage (the head of the Ueda Nagao clan)　and Uesugi Kenshin's elder sister. he was a nephew and became Kensin's adopted son after his father Masakage's death.
Upon Kenshin's death in 1578, Kagekatsu battled Kenshin's another adopted son Uesugi Kagetora for the inheritance, defeating him in the 1578 battle of Ōtate. He forced Kagetora to commit suicide, and became head of the Uesugi clan. Kagekatu was married with Takeda Katsuyori's sister (Takeda Shingen's dauther) after battle of Ōtate.
As a general under Toyotomi Hideyoshi, Kagekatsu took part in the Odawara and Korea campaigns, and rose to prominence to become a member of the council of Five Elders. Originally holding a 550,000 ''koku'' fief in Echigo province, Kagekatsu received the fief of Aizu, worth a huge 1.2 million ''koku'' when Hideyoshi redistributed holdings in 1598. After Hideyoshi's death, that year, Kagekatsu then allied himself with Ishida Mitsunari, against Tokugawa Ieyasu, as the result of some political dispute.
The Sekigahara Campaign could be said to have begun, at least in part, with Kagekatsu, who was the first daimyo to plan revolt against Tokugawa Ieyasu. He built a new castle in Aizu, attracting the attention of Tokugawa, who ordered him to Osaka, to explain his conduct. Kagekatsu refused, and Tokugawa began plans to lead a 50,000 man army north against him. Ishida and Uesugi hoped to occupy Tokugawa Ieyasu with this fighting in the north, distracting him from Ishida Mitsunari's attacks in and around Osaka. Tokugawa expected the likes of this, however, and remained in Osaka to fight Ishida; his generals Mogami Yoshiaki and Date Masamune would fight Kagekatsu in Tōhoku (the far north-east of Honshū, Japan's main island). Kagekatsu had intended to move his force south, attacking the Tokugawa from the north-east while Ishida attacked from the west, but he was defeated very early in the campaign, at the siege of his castle at Shiroishi.
Declaring his allegiance to Tokugawa following his defeat, Kagekatsu became a ''tozama'' (outsider) daimyo; he was given the Yonezawa han, worth 300,000 ''koku'', in the Tōhoku region. Kagekatsu would later fight for the Tokugawa shogunate against the Toyotomi clan in the 1614-15 siege of Osaka.

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References

★ Frederic, Louis (2002). "Japan Encyclopedia." Cambridge, Massachusetts: Harvard University Press.

★ Sansom, George (1961). "A History of Japan: 1334-1615." Stanford, California: Stanford University Press.

★ Turnbull, Stephen (1998). 'The Samurai Sourcebook'. London: Cassell & Co.