Zheng He's Treasure Fleets and Why the Voyages Stopped

Between 1405 and 1433 the Ming court sent seven enormous fleets into the Indian Ocean under the command of Zheng He, a Muslim eunuch admiral from Yunnan, reaching Southeast Asia, Sri Lanka, the Indian coast, Hormuz, Arabia and the East African littoral. Then it stopped, and did not resume. The usual version of why — that China "turned inward" — is too simple to be useful. The voyages ended because their patron died, because they were ruinously expensive, because the strategic threat was on land rather than at sea, and because the officials who controlled the treasury disliked the people running them.

What the expeditions actually were

The first thing to fix is the category. These were not voyages of exploration in the sense the word usually carries: the routes were long established, the ports were known, and Chinese, Arab, Persian, Gujarati and Malay merchants had been working the Indian Ocean for centuries. Nor were they trading expeditions in the chartered-company sense. And they were not colonising ventures.

They were instruments of state diplomacy. The fleets carried envoys, escorted foreign embassies to and from the Ming court, enrolled rulers in the tribute system that organised Ming foreign relations, and used force where the court judged it useful — at Palembang against a pirate leader, and in Ceylon, where a local ruler was seized and taken to Nanjing. They returned with embassies, exotica and animals, including the giraffe presented at court that officials read as an auspicious beast.

Asking why China did not use them to colonise is therefore asking why a hammer is a bad saw. The project had aims, it pursued them, and it succeeded on its own terms — Malacca, whose rise as a port under Ming patronage is part of the history UNESCO recognises in its listing of the Straits of Malacca cities, is the clearest example.

What the evidence base looks like

For a project on this scale the documentary record is surprisingly thin, and knowing why is part of understanding the subject.

The core contemporary material includes stone inscriptions erected by Zheng He and his officers before the last voyage, which summarise the expeditions; and three books by men who sailed with the fleets, recording the places, peoples, products and customs they encountered. A navigational chart preserved in a seventeenth-century military compendium records the routes. Beyond that, the official histories compiled later provide the framework.

What is largely missing is the administrative archive: the logistics, the budgets, the orders. There is a much-repeated story that a Ming official deliberately destroyed the voyage records to prevent the enterprise being revived. That story appears in a source written long after the events, and historians treat it with reserve rather than as established fact. It is a good example of a claim worth attributing rather than repeating — the kind of habit that how historians date events argues for in a different register, and that how we know what historical figures actually did sets out as a general test for any story told about a named person.

The ship-size argument

No part of this subject generates more heat than the dimensions.

Later Ming texts give the largest treasure ships as something in the region of forty-four zhang long and eighteen wide, which converts to roughly 130 metres by 55 metres — far larger than any European vessel of the period and larger than most wooden ships ever built anywhere. Sally K. Church devoted a long article in Monumenta Serica to the plausibility of 450-foot treasure ships, and the fact that the question needed forty-three pages tells you how much rests on a small number of figures in texts compiled well after the fact.

The dispute turns on three things: what wooden hulls can structurally sustain before they hog and work themselves apart; how Ming units of measurement should be converted and whether the figures describe a hull or something else; and how much confidence to place in numbers transmitted through later compilations. Robert Finlay's earlier study in Terrae Incognitae situated the ships inside an argument about what the whole enterprise was for, which is the right frame — a ship's size is only interesting because of what it implies about the state that built it.

What is not in dispute is that the fleets were very large indeed by the standards of anything else afloat in the early fifteenth century, in ship numbers and in crew. Sceptics about the individual dimensions are not sceptics about the scale of the undertaking.

Why they stopped

Four pressures, and they compounded.

The patron died. The Yongle emperor had taken the throne from his nephew in a civil war, and a usurper's legitimacy is expensive to maintain. The voyages were one of several spectacular projects that made the case for his reign. He died in 1424, and his successor suspended them almost immediately. One further expedition sailed under the next emperor, and that was the end.

The money ran out of reasons. The fleets returned prestige, embassies and rarities, not revenue. Meanwhile the same treasury was paying for the relocation of the capital to Beijing, the works that went with it, repeated campaigns against Mongol confederations, and a long, unsuccessful occupation of Vietnam. When a programme produces no fiscal return and the budget is under pressure, it is the programme that goes.

The threat was on land. The Ming security problem was the northern steppe frontier, and it never stopped being the northern steppe frontier. In 1449 a Ming emperor was captured on campaign against the Oirats, which settled the argument about where attention and money belonged for a long time afterwards.

The court faction that ran them lost. The voyages were a eunuch enterprise, commanded and staffed by the emperor's personal household establishment. The civil bureaucracy, recruited through the examinations, regarded eunuch power as a structural danger and opposed the projects that expanded it. Ending the voyages was partly a move in that fight.

Notice that none of these is about a Chinese aversion to the sea, and keeping individuals inside the structures they acted within is what stops the story collapsing into Zheng He's personality or an emperor's whim.