Kagekatsu was the son of Nagao Masakage, the head of the Ueda Nagao clan and husband of Uesugi Kenshin's elder sister, Aya-Gozen. After his father died, he was adopted by Kenshin. His childhood name was Unomatsu.
In 1577, He participated in Battle of Tedorigawa.
Upon Kenshin's death in 1578, Kagekatsu battled Kenshin's other adopted son Uesugi Kagetora for the inheritance, defeating Kagetora in the 1578 Siege of Otate.
In 1579, He forced Kagetora to commit seppuku, and became head of the Uesugi clan. Kagekatsu married Takeda Katsuyori's sister (Takeda Shingen's daughter) after the Siege of Otate.

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