1. The Plague Demon of the Ru River (汝河瘟魔)
The Double Ninth Festival (Chongyang Jie / 重阳节), observed on the 9th day of the 9th lunar month, is one of China’s oldest traditional festivals. While today it is associated with respecting the elderly and appreciating chrysanthemums, its mythological origins are far darker—rooted in an ancient battle against a demonic bringer of disease.
According to legend recorded in early texts, during the Eastern Han Dynasty, a terrible plague demon dwelled in the Ru River (Ru He / 汝河). Whenever it emerged, it spread a devastating pestilence that killed entire villages, leaving survivors weeping over mass graves. The demon was particularly drawn to households with young children, and its appearance was heralded by a foul stench and a sudden drop in temperature.
2. The Disciple’s Quest (桓景学道斩妖)
In a village near the Ru River lived a young man named Huan Jing (桓景), whose own parents had perished in one of the demon’s plagues. Consumed by grief and a burning desire for vengeance, Huan Jing set out to find a master who could teach him the arts of demon-slaying.
His quest led him to a remote mountain where an immortal sage named Feichangzi (费长房) resided. The sage, moved by Huan Jing’s filial grief and determination, accepted him as a disciple. For months, Huan Jing trained tirelessly, learning swordsmanship, talismanic magic, and the secret weaknesses of demonic entities. One day, Feichangzi summoned him and said: “The plague demon will strike your village again on the 9th day of the 9th month. Return home immediately. Give every household a pouch of dogwood (Zhuyu / 茱萸) to hang on their arms, and lead them to the highest mountain top. Only then will they be safe.”
Huan Jing raced home and spread the sage’s warning. On the fateful morning, he distributed the dogwood and led the villagers to a high peak. He alone remained at the village’s edge, concealed with his magical sword. When the demon emerged from the river’s mist, sniffing the air for victims, Huan Jing leaped from his hiding place. After a ferocious battle, he drove his sword through the demon’s heart, destroying it forever.
3. The Legacy of Elevation (登高避灾的传承)
When the villagers descended from the mountain and saw the demon’s corpse, they erupted in celebration. Feichangzi’s wisdom had revealed three powerful tools against evil: climbing to high ground (to literally rise above danger), wearing dogwood (whose pungent aroma repelled demons), and drinking chrysanthemum wine (believed to cleanse the body of miasma).
These three customs—climbing heights (Deng Gao / 登高), wearing dogwood, and drinking chrysanthemum wine—became the immortal trinity of the Double Ninth Festival. Even today, millions of Chinese families climb hills and mountains on this day, honoring Huan Jing’s courage while literally elevating themselves above the year’s accumulated misfortunes. The number nine (Jiu / 九), being the highest single-digit number, was already considered supremely yang and auspicious; paired with another nine, the day became the ultimate symbolic fortress against darkness.