Emilie du Châtelet

Émilie le Tonnelier de Breteuil, Marquise Du Châtelet-Lomont

Émilie le Tonnelier de Breteuil, Marquise Du Châtelet-Lomont (1706-49)

Emilie du Châtelet was a prodigy, a female scientist and mathematical savant, during a time period in which women simply were not considered suited to or capable of great intellect.  After meeting and falling in love with Voltaire, she redesigned her life so that she and Voltaire could live together and study science, math, poetry, literature, and more. It was the advent of humanism and her lifestyle choice was considered scandelous or avant garde depending on the viewer…They created their own personal academy at Cirey and the leading minds of Europe were their guests or correspondents. As time progressed, she spent untold hours attempting to understand the laws of nature while in the midst of the growing turbulence of her relationship with Voltaire.  A relationship that ruled both of their lives and allowed her to become in her words, “A thinking creature,” but also directly contributed to her untimely demise. The flames that burn most brightly cannot linger…

Biography by Judith Zinsser for Women in Science – Miami University
Gabrielle Emilie le Tonnelier de Breteuil, born in Paris, 17 Dec. 1706 to a well-connected noble family, had every privilege for a little girl of her time. Her father, the baron de Breteuil was a favorite of the king, Louis XIV, and both he and her mother Anne de Froullay had relatives and friends who could help to advance the family’s interests. When she was eighteen, in 1725, they arranged for their only daughter to marry into one of the oldest lineages of Lorraine, a semi-independent duchy in northeastern France. The marquis Du Châtelet brought his title but little wealth. For the first years of her marriage, the new marquise lived a very traditional life: she bore him a daughter and two sons, ran their first household in Semur where he was the military governor, and when it was appropriate enjoyed all the pleasures of Paris: dressing elegantly, going to the theater and the opera, gambling at the houses of her noble friends.

Pierre-Louis Moreau de Maupertuis

Pierre-Louis Moreau de Maupertuis (1698-1759)

Probably in 1733 when she was once again in Semur awaiting the birth of her second son, Du Châtelet became interested in mathematics and began to read widely in philosophy and other learned subjects. She returned to Paris to take up serious study of Descartes’ analytical geometry first with Pierre-Louis Moreau de Maupertuis and then with his colleague, the young mathematics prodigy Alexis-Claude Clairaut. From this point on, though Du Châtelet continued to care for her husband’s and children’s interests and ran the household–taking extra responsibilities when the marquis had to rejoin his troops for the wars of the 1730s and 1740s–she found time to continue reading, studying and finally writing and publishing her own works of “natural philosophy,” the equivalent to our modern “science.”

Alexis Claude de Clairaut

Alexis Claude de Clairaut (1713-1765)

Little is known about her early education. It is likely that she was allowed to study Latin and geometry with her younger brother, but otherwise she was self-taught. By the time she published her first book, Institutions de physique (Foundations of Physics) in 1740, she had read widely in Latin, English, and Italian in fields as diverse as moral philosophy, chemistry, physics, theology, mathematics, metaphysics, natural and experimental philosophy. The essay she submitted to the 1738 Royal Academy of Sciences competition “on the nature and propagation of fire” had been published, and she had been accepted as a member of the learned Republic of Letters. She gained additional fame when she bested the executive director of the Academy of Sciences on the issue of the proper formula for kinetic energy, saw her writings on science translated into Italian and German, and was elected to the Bologna Academy of Science. Just before her death 10 Sept. 1749 from a pulmonary embolism, a consequence of her last pregnancy, she had completed a translation of Isaac Newton’s Principia and her own commentary on it, that both corrected and completed many of the Englishman’s key hypotheses proving the role of attraction in the universe. Published in final form ten years later in 1759, as part of the excitement occasioned by the return of Halley’s comet– calculating a comet’s orbit had been one of the main proofs of attraction.

Voltaire Emilie du Chatelet Urania the Play

François-Marie Arouet nom de plume Voltaire (1694-1778)

The rest of Du Châtelet’s writings circulated among the learned, part of the clandestine literature of this first half of the Enlightenment. Her Discours sur le bonheur (Discourse on Happiness), a very personal exposition of what makes for our happiness– was first published in 1779 . Others exist only in manuscripts dispersed throughout libraries in France, Belgium and Russia. They include: a reworking and translation into French of sections of Bernard Mandeville’s Fable of the Bees; a massive critical commentary on the Old and New Testaments, Examens de la Bible; short essays on optics, liberty, and grammar.  Read Excerpts of Emilie Du Chatelet Writings

Until the last decade, Du Châtelet was best known because of her two lovers: Voltaire, the French poet, playwright and philosophe, who was her companion for fifteen years, even after he took his niece as a lover; Jean-François de Saint-Lambert, the young soldier-poet with whom she fell in love in 1748. He was the father of her last child, the daughter who occasioned her death on 10 Sept. 1749.

Jean-François de Saint-Lambert Urania the Play

Jean-François de Saint-Lambert (1716-1803)

Du Châtelet is significant not only for her writings– hers remains the only full translation of the Principia in French– but also for what her life and accomplishments tell about the possibilities for a woman of her day. She read, studied, wrote, published, and gained recognition in a learned world meant to be exclusively male. That all but her amorous life was lost to history, her writings forgotten or attributed to others, demonstrates how fragile women’s stories are and how important they are to discover and tell.

Emilie du Châtelet Daring Genius of the Enligtenment Judith Zinsser

Emilie du Châtelet Daring Genius of the Enligtenment by Judith Zinsser

Emilie du Châtelet Life Timeline

1706 Birth of Gabrielle-Émilie de Breteuil
1710 Significant writings of Leibniz are written, Essai de Theodicee sur la bonte de Dieu, la liberte de l’homme et lorigine du mal, which would influence Mme du Chatelet enormously.
1715 Death of Louis XIV, the family moves to Paris.
1716 Death of Leibniz, though Émilie is only ten young years old the writings of this now deceased metaphysician would greatly influence her life.
1725 Émilie marries Florent-Claude Chastelet.
1726 Birth of a daughter.
1727 Birth of a son. Death of Newton, a man who again would greatly influence her life and to whom she would dedicate much of her life by producing a translation of Newton’s Principia Mathematica.
1728 Death of Mme du Châtelet’s father. Voltaire publishes La Henriade.
1730 Voltaire writes Brutus.
1731 Voltaire writes Historie de Charles XII
1733 Beginning of a lasting friendship with Voltaire. Voltaire’s Lettres anglaises published in England.
1734 Lettres anglaises ou Lettres philosophiques condemned and Mme du Châtelet and Voltaire go to live in Cirey.
1735 Mme du Châtelet begins the translation of Mandeville’s Fable of the Bees.
1736 Mme du Châtelet works on Grammaire raisonnée along with Voltaire and Le Monddain.
1737 Mme. du Châtelet submits essay ‘Sur la Nature du fue’ to Academie des Sciences; works on Examen de la Genese (1737-42). Voltaire writes Elements de la philosophie de Newton; works on Traite de metaphisique (1734-8).
1739 Mme du Châtelet writes Institutions de Physique
1742-45 Voltaire, Mahomet and Merope write Le Poeme de Fontenoy.
1746 Mme du Châtelet works on Discours sur le Bonheur. (1746-8).
1749 Mme du Châtelet completes translation and commentary on Newton’s Principia Mathematica.
Mme du Châtelet dies on September 10th.


Judith P. Zinsser. Emilie Du Châtelet: Daring Genius of the Enlightenment. New York: Viking, 2006.

Judith P. Zinsser. Selected Philosophical and Scientific Writings (The Other Voice in Early Modern Europe) Chicago: University Of Chicago Press 2009.

2006 catalog from the French National Library Exhibition – Text in French

Judith P. Zinsser and Julie Candler Hayes, eds. Emile Du Châtelet: Rewriting Enlightenment

Philosophy and Science. SVEC [Studies on Voltaire and the Eighteenth Century] (2006:1)

Elisabeth Badinter. Les Passions intellectuelles. Paris: Fayard, 1999.

Mary Terrall.”Vis Viva.” History of Science 42 (2004): 189-209.

René Vaillot. Avec Mme Du Châtelet. 1734-1749. Edited by René Pomeau. Vol. I, Voltaire en son temps. Oxford: Voltaire Foundation, 1985-95.

Project Vox – An online source dedicated to including women in the canon of Modern Philosophy

View selected original works of Emilie du Châtelet – French Only

Read about Emilie in Stanford’s Encyclopedia of Philosophy

Learn More About Emilie on Wikipedia