Alexander’s Conquest of the Persian Empire

Alexander’s conquest of the Persian Empire appears as a compact historical example in Jean-Jacques Rousseau’s attack on the claim that luxury and wealth strengthen states. By setting Cyrus’s monarchy against a small force led by an impoverished prince, Rousseau argues that riches cannot substitute for the civic qualities on which political endurance depends.

Background and Argument

Rousseau places the conquest in a series of reversals between rich powers and poorer adversaries. He challenges contemporary politicians’ habit of measuring a person’s worth by economic value and a state’s strength by wealth, opposing that calculation to an older political emphasis on morals and virtue. The Persian example is the first in a sequence meant to show that material abundance does not reliably determine military or political outcomes.

The Conquest as Evidence

Rousseau states that the monarchy of Cyrus was conquered by 30,000 men under a prince poorer than the meanest Persian satrap. The contrast supplies the episode’s argumentative force: the conqueror’s poverty and the numerical limit of his army stand against the wealth and scale implied by the Persian monarchy. Rousseau gives no campaign details or account of the conquest’s course; he uses its outcome as evidence against treating riches as a guarantee of power.

Place in the Series of Reversals

The Persian example leads into further contrasts. Rousseau next recalls the poor Scythians’ resistance to powerful monarchs, then compares two republics, one rich and one poor, with the poorer one prevailing. He extends the pattern to the Roman Empire, which, after absorbing the world’s riches, fell to peoples unfamiliar with wealth. Together these cases turn conquest and defeat into a recurring counterpoint to economic measures of political strength.

Significance

The episode supports Rousseau’s distinction between wealth and the qualities that make a state durable. His larger question is whether a state should have a brilliant but brief existence or a virtuous and lasting one. Alexander’s victory over Cyrus’s monarchy supplies a concrete historical instance of the central paradox: material riches may accompany power, but they cannot by themselves secure the morals and citizens Rousseau regards as indispensable.