This monument represents the remains of Isozaki Jinja (Isozaki Shrine).
Isozaki Jinja is located at Nakadomari in Kuwagasaki, Yuzawa city. Right next to the shrine, there is a smaller shrine, which is called Terada Yakushi Nyorai. There, Yakushi Nyorai, who is the Buddha of healing and medicine, is enshrined. It is said that Fukakusa personally practiced Buddism under the Medicine Buddha. The small shrine is known as Yakushi Doh. There was also a pond located near here, called Komachi Izumi, where Komachi used to wash her face to cure smallpox.