Geographical coordinates: Quanzhou Prefecture, Jiuri Mountain, Fengzhou, Zaiton Port, Houzhu Harbor, Yanfu Temple, Zhaohui Temple

Have you ever wondered how ocean-going fleets decided when to depart in an age before satellites and weather radar?

They used a mountain.

Jiuri Mountain, a small peak west of Quanzhou. On its cliffs are carved 78 inscriptions.

Not poems. Records of a Song-Yuan dynasty state institution: wind-praying.

Every winter-spring transition, the Prefect of Quanzhou led customs officials up Jiuri Mountain. They prayed to the sea god and waited for the monsoon. When the wind turned, hundreds of ships weighed anchor simultaneously, heading for the South Seas, India, and Arabia.

This wasn’t superstition. It was a national maritime meteorological observation system that ran for over a century.

I. 1087: One Institution Changed Everything

618 AD. Quanzhou was established as a prefecture. But Quanzhou’s true maritime journey began in 1087.

That year, the Northern Song government established the Fujian Maritime Trade Commissioner (Shibosi) in Quanzhou. The commissioner managed foreign trade, customs, and fleet safety.

How do you keep fleets safe?

You wait for the wind.

From Jiuri Mountain, the view of the Jinjiang River estuary is unobstructed. The Song court listed the wind-praying ceremony in the national register of state sacrifices. Every winter-spring departure and summer-autumn return, the Prefect personally led the ceremony.

An inscription from 1151 AD details the prayer procedures. The ritual was held at Zhaohui Temple, scheduled according to the 24 solar terms — “Beginning of Winter” and “Beginning of Summer” were the key dates.

During the Southern Song, over 30 prefects performed wind-praying at Jiuri Mountain. Zhen Dexiu was among them.

Thirty mayor-level officials climbing a mountain to pray to heaven. What does that tell you? Meteorological forecasting carried enormous weight in ancient overseas trade.

II. 78 Inscriptions, 100 Years of Maritime Logs

78 inscriptions. Over 50 from the Song, 6 from the Yuan.

13 inscriptions specifically document “praying for wind” or “thanking the wind.” They cover a complete century from 1166 to 1266 AD.

Every single one is an original government document.

In the winter of 1174 AD, Prefect Xue Shusi climbed the mountain to pray. The inscription records the exact Sexagenary Cycle date and lists dozens of officials by name.

Another inscription from 1223 AD records the scale of the ritual and the allocated budget. How much it cost is carved in stone.

Not poetry. Ledger entries.

III. The Monsoon Was 15 Days Late, So the Ritual Was 15 Days Late

The logic behind wind-praying was a profound understanding of monsoon patterns.

By the 11th century, Quanzhou people had mastered the East Asian monsoon. From the 10th to 11th lunar months, the northeast monsoon carried fleets to the South Seas and India. From the 4th to 5th months of the following year, the southwest monsoon brought them home.

Jiuri Mountain was the “wind-watching” point. Officials observed banners — the direction the flag flew determined which way the ships sailed.

Fleets from 58 trading nations scheduled their voyages according to the weather patterns observed at Jiuri Mountain.

In 1183 AD, the monsoon arrived late. The winter wind-praying ceremony was postponed by 15 days. The inscription records this anomaly.

A 15-day margin of error. That was the precision of 12th-century maritime weather forecasting.

IV. From Mountain God to Sea God to Mazu

The original deity at Jiuri Mountain was “Tongyuan Wang” — a mountain god who, through demonstrated “efficacy,” was promoted to sea god.

In 1123 AD, Mazu received her first imperial title “Shunji.” Before that, Tongyuan Wang was Quanzhou’s primary maritime protector.

The inscriptions reveal a fascinating pattern: Tongyuan Wang received multiple imperial promotions during the Southern Song. Each promotion coincided with a surge in Quanzhou’s foreign trade revenue. The better the trade, the higher the god’s rank.

By the mid-13th century, Mazu worship was ascendant. Jiuri Mountain’s ritual system began to integrate with it. Over 10 records of temple repairs and statue donations survive among the inscriptions.

Faith and commerce, carved together in stone.

What It All Means

The Jiuri Mountain inscriptions aren’t cold characters.

78 inscriptions. 13 official wind-praying records. 30 prefects. 58 trading nations. 100 years of continuous observation. A 15-day margin of error.

Put these numbers together, and what do you get?

A 1,000-year-old global trade weather forecasting system.

On chinaroots.org, we overlap the inscription data with Song Dynasty monsoon models. If your family is from southern Fujian, your ancestors might be in one of those data points. They were watching the banners on Jiuri Mountain, deciding when to set sail.

(This article draws from the Quanzhou Cultural Relics: Jiuri Mountain Records, Quanzhou Customs Chronicle, and Science and Technology Records of Quanzhou. Thanks to everyone who kept the records.)