Hōjō Ujiyasu
Domestically, Kenshin left behind a succession crisis. While he never had any children of his own, Kenshin adopted two boys during his lifetime. His nephew, Uesugi Kagekatsu, was probably adopted for deflection of the antagonism by Kagekatsu's father, Nagao Masakage, relatives and supporters. Another adopted son, Uesugi Kagetora, who was originally the son of Hōjō Ujiyasu, was adopted to secure the Echigo's borders. Some suppose that Kagekatsu was intended to be gradually set up as his heir, while others that Kenshin decided to divide the estates between the two.