Mount Hiei is a mountain to the northeast of Kyoto, lying on the border between the Kyoto and Shiga Prefectures, Japan.
The temple of Enryaku-ji, the first outpost of the Japanese Tendai sect of Buddhism, was founded atop Mount Hiei by Saichō in 788 and rapidly grew into a sprawling complex of temples and buildings that were roughly divided into three areas:
The Saitō area near the summit, and technically in Kyoto Prefecture.
The Tōdō area, also near the summit, where Enryaku-ji Temple was first founded, and located just within Shiga Prefecture.
The Yokawa area near the northernmost end of Mount Hiei. Due to its remoteness, as a temple complex it experienced periods of revival and decline, starting with Ennin, later revived by Ryōgen and made famous by the scholar-monk Genshin.
Due to its position north-east of the ancient capitol of Kyoto, it was thought in ancient geomancy practices to be a protective bulwark against negative influences on the capitol, which along with the rise of the Tendai sect in Heian period Japan meant that the mountain and the temple complex were politically powerful and influential.