The final (and possibly ultimate) sort of empire is the Trade Empire. These develop more because exploring traders have a need for safe bases and secure lines of communication to make their trade work. Theoretically trade empires could be land based (and both the American West and the Chinese spread down the Silk Road argue the case that they started as trade security rather than conquest … no matter how they finished). But in reality the main cause of and reason for trade empires is the development of water transport. Specifically ocean transport.
So let us consider the motives of Empire in a few cases.
The Phoenicians had a magnificent trade empire, though with a few elements we find familiar from the more recent Viking version, or indeed the Venetian “Republic” — namely a bit of raiding, and quite a bit of slave trading. All three broadened into a bit of conquest — Carthage, Normandy and the sack of Constantinople in the 4th Crusade come to mind — but all those offshoots were by-products of the original cultures, and none of them became the norm for the ongoing home culture (each of which faded away as circumstances changed and they failed to adapt). So we could say that they were essentially trading empires.
Greece and Carthage and Rome were also trade empires, initially letting their security concerns drag them into a bit of conquest on the side. The difference in their cases was that the conquest element became dominant and completely changed the “homeland”. The city states of Greece becoming the world-conquering hordes of Alexander, and completely undermining the vibrant city state cultures that had proceeded them. The Phoenician trading city of Carthage becoming an expansionary conquest state that eventually pushed Rome too hard. And Rome’s overseas campaigns in Spain and North Africa completely undermining the independent farmer/citizen/soldier class of the Roman Republic, and replacing them with a system of professional troops whose loyalty could only be bought by ever increasing conquests by the emperors.
Naturally every expansion eventually reaches limits, and the concern reverts to trying to secure what you have, and hold the outsiders further away. Which is why, amusingly, people like the Romans and the Chinese came through their expansionary conquest phase, and then found themselves back in the position of having to protect the fringes through deals with tribes that can be traded with/employed by/or paid tribute. Cue Attila the Hun and his ilk.
So empires on the way down may also be considered trade and security empires I suppose, though many still had a conquest impulse (for fame or fortune or simply to pay the defenders off) built in, or tried to act as if they were still conquering hordes. Cue Constantinople and Belisarius.
In fact most empires will go through a variety of stages, though I think it fair to say that most empires have a core purpose and attitude, no matter how they tinker at the edges to deal with specific circumstances.
Nigel Davies, “Types of Empires: Security, Conquest, and Trade”, rethinking history, 2020-05-02.
May 8, 2025
QotD: Trade empires
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