Ashiya Doman- Japanese FigureMortal

The Rival of Seimei

Ashiya Dōman appears in Japanese setsuwa literature as the chief antagonist to the legendary onmyōji Abe no Seimei. While Seimei served the imperial court as its foremost diviner and spiritual protector, Dōman operated as a freelance practitioner whose ambition and willingness to use dark arts set him apart from the court-sanctioned tradition.

The most famous encounter between the two occurs in the tale of the sealed box. A patron placed an object inside a container and challenged both onmyōji to divine its contents. Dōman correctly identified what had been placed inside, but Seimei, using his superior arts, had already transformed the contents through magic. When the box was opened, Seimei's answer proved true and Dōman's false. The tale encapsulates their rivalry: Dōman possesses genuine skill, but Seimei's power operates on a higher plane entirely.

In other accounts from the setsuwa tradition, Dōman attempted to curse Fujiwara no Michinaga, the powerful regent whom Seimei served as spiritual advisor. Seimei detected and countered every curse Dōman sent, protecting Michinaga from harm. When Dōman's schemes were finally exposed, he was defeated and, in some versions of the tale, executed for his crimes against the court.

The Dōman Mark

Dōman's legacy endures most visibly in the folk magic traditions of Japan, particularly in the Ise-Shima region. The "Dōman" (ドーマン) is a lattice pattern of intersecting horizontal and vertical lines, used as a protective talisman alongside the "Seiman" (セーマン), Abe no Seimei's pentagram. Ama divers of Ise-Shima traditionally painted both marks on their equipment to ward off evil spirits underwater, a practice that persists in some communities.

The pairing of the two marks reflects how folklore transformed the rivalry between Dōman and Seimei into complementary protective forces. Where Seimei's pentagram represents the power of the five elements in onmyōdō, the Dōman lattice is said to trap and bind malevolent spirits within its grid. The historical onmyōji rivalry became, in folk practice, a cooperative defense against the unseen world.

Dōman also appears in later dramatic traditions, including kabuki and jōruri puppet theater, where his role as the archetypal dark sorcerer was expanded and embellished. In these works, he is often given a more sympathetic backstory or portrayed as a tragic figure whose genuine talents were corrupted by jealousy of Seimei's superior gifts.