The area is named after the common name of the temple of Risshaku-ji (立石寺), founded in 860 AD by the priest Ennin (円仁) (AD 793 or 794–864), who is better known in Japan by his posthumous name, Jikaku Daishi (慈覺大師). In 847 he returned to Japan from China and in 854, he became the chief priest of the Tendai sect at Enryaku-ji. Risshaku-ji was founded as a branch temple of Enryaku-ji on Mt. Hiei near Kyoto. Even today the ritual fires brought from Enryaku-ji are still burning in the main temple. It developed into the major Heian period (794–1185) temple for rural Dewa province (now Yamagata and Akita prefectures).[2] This main temple, the Konpon-chūdō, an important cultural asset, is said to have been built in 1356 by Shiba Kaneyori, lord of Yamagata Castle. Most of Risshaku-ji was destroyed during the local wars of the early 16th century and it was rebuilt in 1543 under the monk Enkai. By the Edo period (1600–1868) Risshaku-ji was a powerful institution possessing a fief of 1,420 koku.[2]