The Dangerous Direction From Which Demons Were Most Likely to Swoop

When the Emperor Kammu established Japan’s capital in the new city of Heian-kyo, he could not have foreseen the splendid success his action was to bring. Soon after the city was founded, in 794 [C.E.], it became a flourishing center of culture, the home of a decorative society that for more than 300 years was like an endless pageant embellished with art, literature and music and spiced with titillating love affairs.

The site chosen for the capital was almost ideal for the nurturing of such a society. The gently sloping site was open to the south but enclosed on other sides by forested hills or mountains. The dangerous northeast direction, from which demons were most likely to swoop, was shielded by Mt. Hiei and its protective Buddhist monastery. Many fast-running streams brought clear mountain water, and a navigable river, the Yodo, provided convenient barge transportation to the sheltered Inland Sea that separated Honshu from the island of Shikoku.

— Early Japan, p. 31