Onmyoji

An onmyoji was a master of onmyodo, the way of yin and yang, the Japanese court art of divination, calendar-making, astrology and the aversion of misfortune.

The court specialist

The onmyoji served the imperial court as the specialist in a body of cosmological and divinatory technique derived from Chinese sources, the reckoning of the calendar and the auspicious and inauspicious days, the interpretation of omens and celestial events, divination, and the ritual aversion of the misfortunes and malign influences that the system identified, so the office joined the practical work of calendar and astronomy to the ritual management of unseen dangers. At the height of the tradition the onmyoji held a recognised place in the machinery of the court, organised in a dedicated bureau.

History and afterlife

The art was at its most influential in the Heian court, and its greatest practitioner, Abe no Seimei, became a legendary figure around whom many tales gathered, so the onmyoji passed from history into a rich folklore of the master who commands spirits and reads the hidden order of things. As a formal court institution the tradition declined in later centuries and was eventually abolished in the modern reorganisation of the state, but the figure has enjoyed a vigorous afterlife in Japanese literature, drama and popular culture. The onmyoji thus represents a distinctively Japanese synthesis of imported Chinese cosmology and local practice, the court diviner and ritualist who managed the calendar and the unseen forces on behalf of the state.

Kyoto maintains a shrine dedicated specifically to Abe no Seimei, built on the traditional site of his residence, which functions today as both a place of worship and a significant tourist destination, drawing visitors who come as much for the legendary onmyoji's popular cultural fame as for any ongoing religious devotion, a modern afterlife the historical court office itself could never have anticipated.

Since the late twentieth century the figure of the onmyoji has become a major commercial property across popular media well beyond Japan, driven initially by Yumemakura Baku's novels reimagining Abe no Seimei and their film adaptations from 2001 onward, and more recently by video games, most prominently a mobile game published by the Chinese company NetEase that has drawn a large international player base with no particular background in Japanese history, so that the historical court diviner now reaches a global audience many times larger than the Heian bureaucracy he actually served, almost entirely through fictionalised entertainment rather than through any surviving religious institution.

The onmyoji operated within a specific institution of the ancient Japanese state, the Onmyoryo, or Bureau of Yin and Yang, established under the seventh century Ritsuryo legal codes that reorganised Japanese government on Chinese models, and the bureau combined the calendar office, an astronomical observation office and a divination office under one roof, so the onmyoji were, formally, civil servants within a specific ministry rather than independent diviners attached loosely to the court.