Since Kenshin had no child and suddenly died without deciding a successor, his adopted son Kagekatsu UESUGI and Kagetora UESUGI began a succession race (Otate War).
謙信には実子がなく、後継者を定めることなく急死したため、養子の上杉景勝と上杉景虎が後継ぎ争いを始めた（御館の乱）。