Also called: Nagao Kiheiji (長尾喜平次), Nagao Akikage (長尾顕景), Nagao Kagekatsu (長尾景勝)

Historically: One of Uesugi Kenshin's nephews, he was adopted by Kenshin and named Kenshin's heir along with Uesugi Kagetora. Following Kenshin's death in 1578, he provoked the feud against Kagetora in the Otate no ran for succession. His forces won over those of Kagetora in 1579, and he forced Kagetora to commit suicide. He lost the Uesugi's western holdings to Oda Nobunaga, and later submitted to Toyotomi Hideyoshi, under whom he rose to prominence to become a member of the council of five regents appointed by Hideyoshi to protect the Toyotomi rule.

As a general under Toyotomi Hideyoshi, Kagekatsu received the 1.2 million-koku fief of Aizu in addition to his 550,000-koku fief of Echigo. After Toyotmi's death, Kagekatsu was one of the first daimyo to plan revolt against Tokugawa Ieyasu with the building of a new castle in Aizu and the accumulation of troops, and could be said to have least partly begun the Battle of Sekigahara. He refused a summons from Tokugawa to go to the capital to explain himself, and attacked with a 50,000 army, which were held back by Mogami Yoshiaki and Date Masamune. Kagekatsu was defeated early at the siege of his castle at Shiroishi and declared his allegiance to Tokugawa.

Afterwards, Kagekatsu was given the 300,000-koku Yonezawa-han in the Northeast.