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Also known as Charles-Louis de Secondat, Baron de Montesquieu, Charles de Secondat

1689 – 1755 · La Brède, Bordeaux, Paris

Traditions: Modern European

In brief

Montesquieu (1689–1755) was a French magistrate, novelist and political philosopher. His full name was Charles-Louis de Secondat, baron de La Brède et de Montesquieu. His satirical novel Persian Letters (1721) made him famous. His major work, The Spirit of the Laws (1748), asks why laws differ so much from one society to another. His answer is that laws must fit a country's form of government, climate, soil, religion, trade and customs. He sorted governments into republics, monarchies and despotisms, and gave each a driving 'principle'. He argued that liberty needs power to check power, so the legislative, executive and judicial powers should be held by different hands. The framers of the US Constitution treated him as the authority on this idea.

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Life

Montesquieu was born in January 1689 at the château of La Brède, near Bordeaux. From 1700 to 1705 he was taught by the Oratorian priests at Juilly, then studied law at Bordeaux, taking his degree in 1708, and spent some years in Paris. After his father died in 1713 he returned home. In 1715 he married Jeanne de Lartigue, a Protestant; they had a son and two daughters. In 1716 his uncle left him the title baron de Montesquieu and a senior judicial office, président à mortier, in the Parlement of Bordeaux, the region's high court. For about eleven years he presided over its criminal division, which meant hearing cases, overseeing prisons and administering punishments, including torture. He also joined the Bordeaux Academy and gave papers on scientific topics. Persian Letters appeared anonymously in Amsterdam in 1721 and was an immediate success. He sold his office in the mid-1720s, was elected to the Académie française in 1728, and then travelled through Austria, Hungary, Italy, Germany and the Netherlands. From November 1729 to spring 1731 he lived in England. He returned to La Brède in 1731 with his eyesight already failing. Back in France he wrote Considerations on the Romans (1734) and then, over many years, The Spirit of the Laws, published in Geneva in 1748. He defended it against critics in 1750. He died in Paris on 10 February 1755.

Problems

  • Why laws and institutions differ so much from one society to another
  • What kinds of government there are, and what keeps each of them going or ruins it
  • What political liberty is, and what arrangements of power protect it
  • How far climate, geography, trade and religion shape a people's laws and character
  • Whether institutions such as slavery and despotism can be justified

Core ideas

The spirit of the laws

Montesquieu begins from the striking variety of human laws. Physical laws, he holds, are set and kept by God, but the laws of societies are made by fallible people who are subject to ignorance and error. That does not make them random. In the SEP's summary of Book 1, chapter 3, laws should be fitted to the nature and principle of each government, and also to the climate, the soil, the religion, the commerce and the customs of a people. The 'spirit' of the laws is this web of relations. The SEP calls the result a naturalistic account: it explains institutions by their causes rather than judging them against one ideal model. Montesquieu compares forms of government, Europe with Asia, and ancient Rome with modern states. An open question is how a theory that explains so much by circumstance can still condemn some laws as bad, as Montesquieu plainly does.

Three kinds of government and their principles

Montesquieu distinguishes three kinds of government. In a republic the people, or part of them, rule; a republic can be a democracy or an aristocracy. In a monarchy one person rules by fixed and established laws. In a despotism one person rules by his own will and whim. Each kind also has a principle, the passion that sets it in motion. For democracy it is political virtue, which the SEP glosses as love of the laws and of one's country. For aristocracy it is moderation, for monarchy honour, and for despotism fear. A monarchy also needs intermediate powers, such as the nobility and an independent judiciary, through which the ruler's power flows. When a government's principle decays, the government decays with it; corrupted monarchies and republics tend to slide into despotism. A standing question is whether these types, built from a few historical examples, fit modern states.

Despotism seen from the inside: Persian Letters

Persian Letters is a novel told in letters between two fictional Persians, Usbek and Rica, who travel to Europe in 1711. Their outsiders' misreadings let Montesquieu mock European customs, such as the Pope's authority, and later European vanity and pedantry. A second plot runs underneath. Usbek keeps several wives in a harem at home, guarded by enslaved eunuchs, and rules them as a despot from afar. The SEP notes that his cruelty brings him no happiness. The story ends with his favourite wife, Roxana, who takes her own life after her lover is killed; in her last letter she says that although she lived in servitude she was always free. The SEP reads her death as an indictment of despotic institutions. The book therefore anticipates a theme of The Spirit of the Laws: despotism harms the ruler as well as the ruled. Readers can still ask how far the novel's picture of Persia reflects European stereotypes rather than Persia.

Liberty and the separation of powers

Montesquieu defines political liberty as 'a tranquillity of mind arising from the opinion each person has of his safety' (Spirit of the Laws 11.6, as quoted by the SEP). To secure this, power must check power, so the legislative, executive and judicial powers should not be in the same hands. Drawing on what he saw in England, he favoured a two-chamber legislature that controls taxation, an executive with a veto, and an independent judiciary. He paid unusual attention to criminal law: laws should be clear, should concern outward acts rather than thoughts, and should punish only as much as necessity requires. Judith Shklar called this outlook 'a liberalism of fear'. How strict the separation must be is an open question, discussed below.

Climate, commerce, religion and slavery

Montesquieu held that climate and soil shape temperament and customs. Books 14 to 18 of The Spirit of the Laws compare hot and cold countries, and Asia with Europe. He linked Asia's lack of a temperate zone and its vast plains to a tendency toward despotism. But in the SEP's reading, climate influences people without being irresistible, and good laws should work against its bad effects. Commerce, he argued, is better than conquest: it encourages moderation and peace, cures destructive prejudices, and limits the power of rulers. He treated religions by the good they do in civil society, not by their truth, called for toleration, and opposed basing civil law on religious principles. He held that slavery is 'in its own nature bad' (15.1), rejected religious and racist defences of it, and argued that free labour is more productive even in hot climates. Readers still argue over how much of his climate theory is evidence and how much is prejudice.

Works

  • Persian Letters (Lettres persanes) 1721Satirical novel in letters, published anonymously in Amsterdam; an immediate success.
  • The Temple of Gnidus (Le Temple de Gnide) 1725Short prose poem, published anonymously.
  • Considerations on the Causes of the Greatness of the Romans and their Decline 1734Published anonymously in Amsterdam; a revised edition followed in 1748. Parts were later worked into The Spirit of the Laws.
  • Reflections on Universal Monarchy in Europe printed 1734Montesquieu had the printed edition destroyed at once (ENS Lyon chronology); the SEP dates its writing to 1724.
  • Dialogue of Sulla and Eucrates (Dialogue de Sylla et d'Eucrate) written c. 1724; published 1745Short dialogue on power and ambition.
  • The Spirit of the Laws (De l'esprit des lois) 1748His major work, published in Geneva at the end of October 1748; later placed on the Catholic Church's Index of Forbidden Books.In the Book corner
  • Defence of The Spirit of the Laws 1750Reply to critics of The Spirit of the Laws.
  • Essay on Taste (Essai sur le goût) published 1757Unfinished article left for Diderot and d'Alembert's Encyclopédie and published after his death.

Influences and relationships

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Reception

Persian Letters made Montesquieu a literary celebrity. The Spirit of the Laws was controversial and a great success across Europe, especially in England. The Catholic Church placed it on the Index of Forbidden Books in the early 1750s, despite his Defence. Helvétius and Condorcet wrote responses to it. The SEP says his account of the separation of powers had an enormous effect on liberal political theory and on the framers of the United States Constitution; in Federalist 47 James Madison called him the 'oracle' on the subject. His focus on criminal law inspired reformers such as Cesare Beccaria. Later, Émile Durkheim treated him as a forerunner of sociology. Judith Shklar described his outlook as 'a liberalism of fear'.

Disputed interpretations

How strict is the separation of powers?

Opponents of the proposed US Constitution argued that it broke Montesquieu's maxim that the three powers must be separate and distinct. Madison replied in Federalist 47 that Montesquieu did not mean that the branches should have no partial share in, or control over, one another's acts. He meant only that free government is overturned when the whole power of one branch is held by those who hold the whole power of another. How much overlap the principle allows is still argued over in constitutional debate.

How much does climate decide?

Montesquieu's chapters on climate contain sweeping claims about national character, such as his remark that you must flay a Muscovite alive to make him feel. The SEP stresses that he treats climate as an influence, not a fixed cause, and wants laws to correct its bad effects. Whether his theory is careful comparative social science or rests partly on prejudice remains an open question.

Primary texts

  • The Spirit of Laws (Complete Works, vol. 1) Free to read · oll.libertyfund.orgFree public-domain text at the Online Library of Liberty, from the London 1777 Complete Works. The SEP cites Thomas Nugent's translation (Macmillan, 1949).
  • Lettres persanes, tome I (French) Free to read · Project GutenbergFree French text at Project Gutenberg; volume II is ebook 33856. Standard English translation: C. J. Betts, Persian Letters (Penguin, 1973).
  • Considerations on the Causes of the Greatness of the Romans and their DeclineNo free English text checked. Standard translation: David Lowenthal (Hackett, 1999).
  • The Federalist No. 47 (Madison, 1788) Free to read · avalon.law.yale.eduNot by Montesquieu: Madison's essay showing how the American founders read him on the separation of powers.

Sources

Scholarly sources and reference works, free to read online.

In the Book corner

  • The Spirit of the Laws 1748 · Intermediate
    A vast comparative study, in thirty-one books, of how laws relate to a people's government, climate, soil, religion, commerce and customs; Montesquieu…

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Written and kept up to date by the Coordinates of Thought editors. Each statement was checked against the sources listed above before publishing; this page is not peer-reviewed. Last updated 28 October 2026. How to cite this site.

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Coordinates of Thought Editors. “Montesquieu.” Coordinates of Thought. Last modified October 28, 2026. https://coordinatesofthought.com/thinker/montesquieu/.

BibTeX

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  author       = {{Coordinates of Thought Editors}},
  title        = {Montesquieu},
  howpublished = {Coordinates of Thought},
  year         = {2026},
  month        = oct,
  url          = {https://coordinatesofthought.com/thinker/montesquieu/},
  note         = {Last updated 28 October 2026}
}

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