北条氏康
was the seventh son of Hōjō Ujiyasu; he was adopted by Uesugi Kenshin, and was meant to be Kenshin's heir. However, in 1578, he was attacked in his castle at Otate by Uesugi Kagekatsu—Kagetora's respective brother-in-law—and was subsequently defeated. Kagetora committed suicide the following year.