Who was Zheng He?
A Chinese admiral who commanded seven enormous maritime expeditions across the Indian Ocean in the early fifteenth century — voyages substantially larger than anything Europe launched for another century, undertaken decades before Columbus, and then deliberately abandoned.
His background, which is remarkable in itself. Born in Yunnan to a Muslim family, captured as a child during the Ming conquest of the region, castrated and taken into imperial service as a eunuch. He rose through service to the prince who became the Yongle Emperor, and was given command of the treasure fleet.
The scale. Contemporary accounts describe fleets of over 300 vessels carrying some 28,000 men — against Columbus's three ships and about 90 men. The largest vessels, the "treasure ships", are described in sources as far larger than any European ship of the era, and their exact dimensions are debated by historians, with some figures considered implausible.
Where they went. South East Asia, India, Sri Lanka, Arabia and the east coast of Africa, reaching at least as far as present-day Kenya. They returned with envoys, tribute, goods and animals — including a giraffe presented at court, which caused a sensation.
What the voyages were for. Not conquest or colonisation, and not primarily trade in the European sense. They projected prestige and the tributary system, demonstrating Ming power and drawing states into diplomatic relationship. Force was used on occasion, including against a Sri Lankan king and against piracy.
Why they stopped, which is the historically significant question. After the Yongle Emperor's death, court factions opposed the expense; Confucian officials distrusted eunuch power and foreign entanglement; northern land frontiers demanded resources; and the priority shifted inward. Records were reportedly destroyed, shipyards fell idle, and ocean-going construction was restricted.
Why it matters. It is the clearest historical case of a state possessing overwhelming maritime capability and choosing not to use it — which complicates any account of European expansion as technologically inevitable.
Claims that the fleets reached the Americas are not supported by evidence and are rejected by historians.