Saiō — 斎王

For six centuries, from 673 to 1333 CE, unmarried imperial princesses were sent to live in ritual isolation at Saikū, a purpose-built palace complex near Ise Grand Shrine. These women, called saiō (斎王), served as living intermediaries between the imperial house and Amaterasu, the sun goddess. They were selected by divination, typically between ages ten and fourteen, and removed from the capital to spend years—sometimes decades—performing monthly purification rituals and annual ceremonies at Ise. The last saiō left in 1333 when imperial authority collapsed during the Nanboku-chō period. Today, the archaeological remains of Saikū Palace lie beneath rice fields in Meiwa, Mie Prefecture, where foundation stones and excavated artifacts preserve the memory of Japan’s most disciplined spiritual office.

The saiō institution was established in 673 CE by Emperor Tenmu, who sought to formalize imperial worship at Ise Grand Shrine through a permanent representative of royal blood. The first saiō was Princess Ōku, Tenmu’s daughter, who traveled from the capital to serve Amaterasu after her father’s death. Saikū Palace was constructed as her residence in what is now Meiwa, approximately six kilometers from Ise Jingū. The complex eventually covered 137 hectares and housed not only the princess but also a retinue of officials, attendants, and guards—sometimes numbering over five hundred people. Sixty saiō served across the institution’s history. The role ended abruptly in 1333 when Emperor Go-Daigo fled Kyoto during the Kenmu Restoration, and no successor was appointed. The palace fell into disuse, and its wooden structures rotted away, leaving only earth foundations that were rediscovered through excavations beginning in 1970.

Saikū was not itself a shrine but an imperial residence dedicated to the worship of Amaterasu Ōmikami (天照大神), the sun goddess and ancestor deity of the imperial family, enshrined at Ise Grand Shrine. The saiō acted as her priestess and the emperor’s spiritual proxy, conducting monthly purification rites (misogi) at the Isuzu River and leading the Kannamesai harvest festival at Ise each autumn. The role embodied the principle of saisei itchi (祭政一致)—the unity of ritual and governance—positioning the princess as a sacred vessel maintaining cosmic order through her physical purity and ritualized existence. No other deity was worshipped at Saikū; Amaterasu’s presence was invoked solely through the princess’s disciplined body and the prayers she performed on behalf of the throne.

The most famous saiō in literary memory is Princess Ōku (661–701), sister of Emperor Tenmu, whose journey to Ise is recorded in the Man’yōshū, Japan’s oldest poetry anthology. She composed a poem while resting at a temporary palace in Ōmi Province, lamenting her departure from the capital: “When I look back at the maples of Mount Miwa, autumn colors are showing.” Her homesickness became emblematic of the saiō condition—noble women torn from family and confined to ritual duty. Another legend surrounds the 9th-century saiō Princess Tsuneko, who reportedly broke protocol by secretly corresponding with a court noble. Though no historical record confirms punishment, Heian literature uses her story to symbolize the impossibility of romantic life under such constraints. The Ise Monogatari (Tales of Ise) further romanticized the saiō as an unattainable figure, pure and untouchable, watched by the gods.

Archaeological excavations at the Saikū site have revealed a grid-planned palace complex with multiple residential halls, administrative buildings, and gardens aligned along east-west and north-south axes. The main hall (shinden) featured raised wooden floors, cypress-bark roofing, and vermilion-painted pillars, modeled on Heian aristocratic architecture. A formal avenue connected the palace to the Miya River, where ritual purification ceremonies were conducted. Excavated artifacts include over 40,000 wooden tablets (mokkan) inscribed with administrative records, ceremonial vessels, combs, ink stones, and charred remains of ritual offerings. The most striking find was a foundation stone arrangement indicating the existence of multiple kitchens and storehouses, suggesting the palace functioned as a self-sufficient ceremonial city. Today, the site is preserved as the Saikū Historical Museum, where reconstructed buildings and marker stones outline the original palace footprint.

• Saikū Matsuri (June) — An annual historical reenactment held in Meiwa, where participants dressed in Heian costume recreate the saiō‘s procession from the palace to Ise. The centerpiece is the “Gunchō no Gi,” a slow parade led by a young woman playing the saiō, accompanied by court musicians and attendants carrying offerings.
• Kannamesai Proxy Participation (October) — Though the saiō institution no longer exists, the Saikū Historical Museum occasionally sends representatives to observe the Kannamesai harvest festival at Ise Grand Shrine, echoing the princess’s historical role.

Early June during Saikū Matsuri offers the most immersive experience, when the archaeological site becomes a stage for historical performance. Autumn—October and November—is ideal for those interested in the connection to Ise Grand Shrine’s harvest rituals and for walking the surrounding countryside, where ancient roadways and marker stones trace the saiō‘s ceremonial routes. Avoid mid-summer; the open fields offer little shade, and the museum’s outdoor exhibits become uncomfortably hot.