Aguado was born in Paris in 1827, the second son of the Spanish-born Marquis Alexandre Aguado (1784–1842) and Maria de Carmen Vidoire Moreno. Alexandre Aguado had been a supporter of Joseph Bonaparte during the Peninsular War (1808-1814). Following the war, he went into exile in Paris, and rose to become one of the wealthiest bankers in France. In the 1820s and 1830s, he negotiated a series of loans that saved Spain from bankruptcy, and King Ferdinand VII of Spain conferred on him the title of "Marquis de las Marismas del Guadalquivir" (Marquis of the Guadalquivir Marshes).Hugh Chisholm (ed.), "Alexandre Marie Aguado," Encyclopædia Britannica, Vol. 1, 11th ed. (1910-11), p. 427. Upon his death, his sons, including Olympe, inherited a considerable fortune.
