Key figures: Voltaire (François-Marie Arouet), Jean-Jacques Rousseau
Summary
In the span of just over one month during the summer of 1778, two towering figures of the European Enlightenment died within weeks of each other — Voltaire on May 30 and Jean-Jacques Rousseau on July 2. These deaths marked a symbolic watershed in intellectual history. The two philosophers, despite being exact contemporaries and products of the same Enlightenment epoch, had spent their careers advancing fundamentally opposed visions of civilization, reason, and human nature. Voltaire championed wit, rationalism, religious skepticism, and the fruits of civilized progress; Rousseau emphasized emotion, the corruption of civilization, natural virtue, and the general will. Their concurrent deaths occurred on the eve of the French Revolution, a rupture that would appropriate both thinkers’ legacies — sometimes in direct contradiction — to justify radical transformation.
The symbolic weight of their deaths was recognized immediately and amplified by subsequent history. During the French Revolution, the revolutionary government honored both philosophers by transferring their remains to the Panthéon, France’s monument to its greatest citizens. Voltaire was interred first on July 11, 1791, becoming the first person to receive this honor; Rousseau’s remains followed on October 11, 1794, placed directly across from Voltaire in a deliberate act of symbolic reconciliation. This gesture encapsulated the Revolution’s debt to Enlightenment thought, even as the two dead thinkers represented irreconcilable intellectual traditions.
Background: Two Lives in Opposition
Parallel Careers, Conflicting Visions
Voltaire (born François-Marie Arouet, November 21, 1694) and Rousseau (born June 28, 1712) overlapped in Paris intellectual circles during the 1740s and 1750s but developed in sharply divergent directions. Voltaire’s early career traced an arc from French aristocratic salons through English exile (1726–1729), where he absorbed Locke and Newton, to his long residence at the château of Ferney on the French–Swiss border from 1758 onward. Rousseau’s life was more turbulent: raised in Geneva, he spent years as a servant and vagabond before winning fame in 1750 with a prize essay arguing that civilization and scientific progress had corrupted rather than improved humanity — a thesis that directly challenged the Enlightenment optimism Voltaire exemplified.
Their first serious rift crystallized in 1755–1759. After the Lisbon earthquake of November 1, 1755, Voltaire wrote his Poème sur le désastre de Lisbonne, attacking providential optimism and the claim that this is the “best of all possible worlds.” Rousseau replied with his Lettre à Voltaire sur la Providence (August 1756), defending cautious optimism and arguing that human arrangements, not God or nature, were responsible for human suffering. Voltaire’s devastating response came in the satirical novella Candide (1759), which skewered both Leibnizian optimism and Rousseau’s romanticization of natural life. By 1760 the break was permanent: Rousseau’s letter to Voltaire — “I hate you with the feelings of one still capable of loving you” — captured the depth of intellectual and personal estrangement that would persist until both men died in 1778.
The Encyclopédie Rift
A secondary fault line ran through their relationship to the great collaborative project of their era: the Encyclopédie edited by Diderot and d’Alembert (published 1751–1772). Voltaire contributed entries enthusiastically, seeing the project as the summation of rational Enlightenment progress. Rousseau contributed articles on music and political economy but grew increasingly alienated from the Encyclopédie circle, whose faith in progress and civilized refinement contradicted his diagnosis of civilization as the source of human corruption. By the late 1750s, Rousseau had broken with Diderot as well, leaving him an isolated figure — simultaneously celebrated and persecuted, his major works The Social Contract and Emile burned in Paris and Geneva in 1762, forcing him into prolonged exile.
The Final Days: A Parallel Conclusion
Voltaire’s Return and Death (February–May 1778)
After 28 years of effective exile at Ferney, Voltaire returned to Paris on February 5, 1778, at age 83. The return was a cultural event unlike any in European intellectual history. Crowds lined the streets to see his carriage; at the Comédie-Française, the audience chanted his name and crowned him with laurels as his tragedy Irène was performed. On April 29, 1778, in one of the century’s most celebrated meetings, Voltaire met Benjamin Franklin — then in Paris finalizing the Treaty of Alliance with France — at the Académie des sciences. Franklin asked Voltaire to give his blessing to Franklin’s young grandson, and Voltaire placed his hands on the boy’s head, pronouncing: “God and Liberty” — a phrase that crystallized the Enlightenment’s gift to the American Revolution.
Voltaire’s health collapsed under the excitement of Paris. He died on the night of May 30, 1778. The Catholic Church refused him burial within Paris because he had refused to formally recant his lifetime of religious criticism in his final hours; he was interred at the Abbey of Scellières in Champagne. Not until July 11, 1791, would the Revolutionary government bring his remains to the Panthéon.
Rousseau’s Final Weeks and Death (May–July 1778)
Rousseau’s death followed a quieter but no less poignant trajectory. In May 1778, he accepted the hospitality of the Marquis René-Louis de Girardin at the château of Ermenonville, northeast of Paris. He spent his final weeks in the garden, indulging his lifelong passion for botanical collecting. On the evening of July 1, 1778 — the day before his death — he played piano at a household concert and shared a hearty meal with the Girardin family. The next morning, as he was preparing to give a music lesson to Girardin’s daughter, he suffered a fatal cerebral hemorrhage. He was 66 years old. His wife Thérèse was at his bedside. The sculptor Jean-Antoine Houdon was immediately summoned to make a death mask, preserving Rousseau’s features for posterity. He was buried on the Île des Peupliers at Ermenonville, where his tomb became an immediate pilgrimage site.
Significance
The deaths of Voltaire and Rousseau in 1778 represent a fulcrum point in intellectual and political history. Their simultaneous passing marked the end of the Enlightenment as a coherent intellectual movement and the beginning of its fragmentation into competing ideological strands — some libertarian and rationalist (Voltaire’s legacy), others democratic and romantic (Rousseau’s legacy).
Intellectual Divergence: Throughout their lives, Voltaire and Rousseau embodied the central tensions of Enlightenment thought. Voltaire’s worldly engagement, his faith in reason and science, and his vision of an enlightened society governed by rational laws stood in stark contrast to Rousseau’s focus on emotion, nature, and his diagnosis of civilization itself as a source of human corruption. Their quarrels — intellectual and personal — defined much of the French Enlightenment’s internal debate. With both men dead by July 1778, no elder statesman remained to moderate or mediate between these poles.
Revolutionary Appropriation: The outbreak of the French Revolution in 1789, just eleven years after the deaths of Voltaire and Rousseau, vindicated both thinkers’ influence — yet not in harmonious ways. Louis XVI, while imprisoned during the Terror, lamented that “Rousseau and Voltaire have destroyed France,” acknowledging that both philosophers’ ideas had fueled revolutionary ideology. Radicals cited Rousseau’s Social Contract and its doctrine of popular sovereignty to justify terror and dictatorship. Liberals invoked Voltaire’s defense of free speech and religious tolerance. The ideological competition between the two dead philosophers’ legacies became a central feature of Revolutionary politics.
Epochal Closure: By 1778, both philosophers had achieved the status of living legends. Voltaire’s return to Paris in February 1778, after 28 years of exile, was a triumphal homecoming — he was celebrated as the personification of Enlightenment ideals at the apex of his fame and influence. Yet his death just three months later, followed weeks later by Rousseau’s sudden passing, closed an era. The Enlightenment of reason, salons, and individual philosophes gave way to the age of revolution, mass politics, and ideological warfare. The concurrent deaths of Voltaire and Rousseau symbolized the transition from the Age of Reason to the Age of Revolutions.
The Enlightenment and American Independence: The year 1778 linked the death of Enlightenment’s founders directly to the birth of the Republic they had inspired. Benjamin Franklin — whose diplomatic success in Paris secured the Treaty of Alliance on February 6, 1778 — was still in the city when Voltaire died. Rousseau’s death on July 2, 1778, came precisely between two landmarks of the American alliance’s military expression: the evacuation of Philadelphia by the British on June 18 and the Battle of Monmouth on June 28, the first major engagement of the allied military era. The ideas of both men — Voltaire’s rational governance, Rousseau’s popular sovereignty — ran as parallel veins through the Declaration of Independence, the Continental Army’s cause, and the revolutionary literature circulating on both sides of the Atlantic.
The Passing Generation: A Wider Pattern
The deaths of Voltaire and Rousseau in 1778 were not isolated; they were the culminating moment in the passing of the entire Enlightenment founding generation. The physiocrat François Quesnay had died in 1774; David Hume in 1776; the botanist Carl Linnaeus — who died on January 10, 1778, just months before both philosophers — had likewise spent his career as a pillar of rational scientific inquiry. The Encyclopédie was complete; the movement had done its intellectual work. What remained was for the political world to absorb the implications — a process that would unfold with revolutionary violence across Europe for the next three decades.
The cultural counterpart to these intellectual deaths was the founding of new institutions in the same year. La Scala opened in Milan on August 3, 1778 — just 32 days after Rousseau’s death — an institution whose founding represented precisely the kind of high cultural achievement and civic ambition that the Enlightenment had valorized. The Tonkünstler-Societät, Vienna’s first organized musicians’ benefit society, was founded that same year, embodying the social-contract logic of collective welfare that Rousseau had theorized. The age of great individual philosophes gave way to the age of institutions.
See Also
- Voltaire (1694–1778) — biographical account of his life, exile, return to Paris, and death on May 30, 1778
- Jean-Jacques Rousseau (1712–1778) — biographical account of his philosophy, persecution, final weeks, and death on July 2, 1778
- Treaty of Alliance (France–United States) — Franklin met Voltaire in Paris weeks after signing the alliance; Enlightenment thought shaped the American revolutionary cause
- Battle of Monmouth — fought June 28, 1778, four days before Rousseau died; the American military expression of the ideals both philosophers championed
- Carl Linnaeus — Death (January 10, 1778) — died six months before Voltaire; the broader pattern of Enlightenment founding generation’s passing
- La Scala Opens in Milan — opened August 3, 1778, one month after Rousseau’s death; cultural institution born in the same year the movement’s founders died
Sources
- Voltaire — Stanford Encyclopedia of Philosophy
- Jean-Jacques Rousseau — Britannica
- Voltaire — World History Encyclopedia
- Voltaire and Rousseau: irreconcilable contradiction — National Library of Russia
- Rousseau — Internet Encyclopedia of Philosophy
- Benjamin Franklin in Paris — U.S. Department of State, Office of the Historian