Testing the accuracy of marine chronometers aboard the corvette Isis from 1768 to 1769, Charles Pierre Claret de Fleurieu sought a precise method to calculate longitude at sea. This technical expedition established his reputation as a naval expert, bridging the gap between scientific advancement and the strategic requirements of the French maritime fleet.
Naval Service and Scientific Inquiry
Born in Lyon in 1738, Fleurieu entered the French Navy at Toulon in 1755. During the Seven Years' War, he participated in the battles of Mahon, Lagos, and Les Sablettes. By 1765, he began collaborating with horologist Ferdinand Berthoud to refine marine timekeepers. Their findings, published in 1773 as Voyage fait par ordre du roi, pour éprouver les horloges marines, proved essential for celestial navigation. Beyond this work, he authored an atlas of the Kattegat and the Baltic Sea, titled Le Neptune du Nord.
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Appointed director of ports and arsenals in 1777, Fleurieu managed French naval infrastructure for 15 years. He oversaw the planning of naval operations during the American Revolutionary War and facilitated French voyages of discovery, including the expedition of La Pérouse. In 1790, he served briefly as the Minister of the Navy and Colonies under Louis XVI. He later held positions as a member of the Council of Elders and the Council of State.
Political Life and Final Years
Fleurieu navigated the volatility of the French Revolution, suffering 14 months of imprisonment in the Madelonnettes. Under the First French Empire, his political standing recovered significantly. He served as a Minister Plenipotentiary, signing a treaty of commerce with the United States at Morfontaine in 1800. By 1805, he held the rank of admiral and was appointed Governor of the Tuileries and the Louvre. In 1808, Napoleon named him an Imperial Count. He died in Paris in 1810 and received a state funeral at the Panthéon.
Fast facts
- Born: 1738, Lyon
- Died: 1810, Paris
- Military rank: Admiral
- Award: Grand Officer of the Legion of Honour (1804)
- Award: Knight of the Royal and Military Order of Saint Louis (1775)
- Key position: Minister of the Navy (1790-1791)
- Notable work: Voyage fait par ordre du roi (1773)
- Burial site: Panthéon
Questions readers ask
What was his primary contribution to navigation?
He participated in a 1768-1769 expedition to test Ferdinand Berthoud’s marine chronometers, which enabled ships to determine longitude at sea with greater accuracy.
Did he hold any roles under Napoleon?
Yes, he served as a member of the Council of State, Governor of the Tuileries and the Louvre, and was appointed Imperial Count in 1808.
Achievements
- Grand Officer of the Legion of Honour
- Knight of the Royal and Military Order of Saint Louis
- Recorded as explorer, diplomat and politician
