A fourth child, Jules, who, like his father, became a diplomat, was born in Pisa, on 16 February 1809, married Hyacinthe Delarue on 11 March 1874, and died in Paris on 10 October 1887.
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Before the birth, in Versailles, of their third child, Ferdinand (1805–1894), they had a son, Théodore, born in Cádiz on 25 September 1802, married in 1828 to Antonia Denois (27 September 1802–29 December 1878), who died in Saint-Germain-en-Laye on 20 May 1874, and a daughter, Adélaïde (1803–1879), who married Jules Tallien de Cabarrus (1801–1870).
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He served as inspector general in Livorno and as imperial commissioner, under General François-Xavier Donzelot, in Corfu from May 1810 until June 1814, during the Napoleonic Wars, as the British blockaded Corfu in the midst of the Adriatic campaign of 1807–1814.
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Following his first major assignment, as French consul to Morocco, de Lesseps was posted, in 1800, as liaison to the Egyptian Army and as superintendent of trade relations.
Paul-Henri Mathieu | Mireille Mathieu | Ferdinand de Lesseps | Mathieu Darche | Mathieu Turcotte | Mathieu Biron | Mathieu Bertrand | Mathieu Amalric | Charles Mathieu Isidore Decaen | Tyrann Mathieu | Michael Mathieu | Mathieu Carrière | André Mathieu | Alfred Mathieu Giard | Alexandre de Lesseps | W. A. Mathieu | Saint-Mathieu, Quebec | Saint-Mathieu | Nicolas Mathieu Rieussec | Mathieu Tenant de la Tour | Mathieu's equation | Mathieu Schneider | Mathieu Roy | Mathieu-Richard-Auguste Henrion | Mathieu Ravignat | Mathieu Ngudjolo Chui | Mathieu Molé | Mathieu Kérékou | Mathieu Kassovitz | Mathieu Grosch |