How ancient Japanese masters of yin and yang shaped the fate of emperors

Cultures · Published 9 October 2026 Swipe more like this →

In short: In ancient Japan, the onmyōji were technical officers tasked with reading the stars and calendars. Originally restricted to state-sanctioned divination, these masters evolved into powerful spiritual figures who influenced the lives of emperors and shoguns, eventually monopolizing their craft within two elite families for centuries.

The onmyōji originated as technical officers within the Bureau of Onmyō, a department established under Japan's ritsuryō system. Tasked with applying the Chinese philosophy of yin-and-yang and the five phases—wood, fire, earth, metal, and water—these officials were responsible for astrology, calendar-making, and geomorphology. Initially, their duties were strictly secular and administrative, focusing on practical matters like timekeeping with water clocks and selecting auspicious days for capital repairs or construction projects.

By the Heian period, the role of the onmyōji shifted dramatically. Following the relocation of the capital to Heian-kyō, a growing fear of vengeful spirits and personal disasters led the Imperial court to seek protection through spellcasting and ritual. The Bureau of Onmyō absorbed various religious elements, including Taoism, esoteric Buddhism, and ancient Shinto practices. As the original ritsuryō restrictions on private practice weakened, onmyōji began operating outside the government, offering divination and curses to nobles. This transition turned the profession into a source of immense political and spiritual influence.

The craft eventually became a hereditary monopoly held by the Kamo and Abe families. By the 10th century, these families controlled the top positions in the Bureau of Onmyō, passing their secret knowledge exclusively to their descendants. The Abe family, later known as the Tsuchimikado family, rose to significant prominence under the patronage of shoguns like Ashikaga Yoshimitsu. Even as the samurai class rose to power, the onmyōji remained essential to the Imperial court and puppet shoguns, who relied on their predictions to navigate the complexities of power and fortune until the Meiji era.

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