Seienin (清円院) was a Japanese noble woman from the Nagao clan during the tumultuous Sengoku period.
Her family included two brothers, Yoshikage and Akikatsu (later known as Uesugi Kagekatsu), and a younger sister named Hana.
Seienin was subsequently married to Kagetora, and in the following year, she gave birth to their eldest son, Uesugi Dōmanmaru.
There is a strong possibility that she died alongside Kagetora at Samegao Castle, located near Kasugayama and controlled by the Uesugi, along the only route leading to the Kantō region.
[4] Today, at the Meigetsu Temple in Kamakura, there stands a Buddhist mortuary tablet bearing the name of Seienin, serving as a lasting testament to her presence and the tumultuous times in which she lived.