Françoise Julienne Isle de France Poivre Bureaux de Pusy (1770–1845) was the daughter of Françoise Robin Poivre Du Pont de Nemours and the stepdaughter of Pierre Samuel Du Pont de Nemours. Her husband, the engineer Jean Xavier Bureaux de Pusy, spent five years in Austrian captivity with Lafayette. In 1797, the year of his release, Du Pont de Nemours made Bureaux de Pusy an officer and stockholder in his new American company, Du Pont de Nemours, Pére et Fils & Compagnie. The Bureaux de Pusy family arrived in America early in 1800 and shared a household in New Jersey with Du Pont de Nemours’s family before returning in 1802 to France, where the husband accepted an appointment under Napoleon. After she was widowed in 1806, Madame Bureaux de Pusy’s worsening financial situation and the bankruptcy of Du Pont de Nemours’s company prompted her to return to America in 1811 seeking to liquidate her remaining shares in the surviving Du Pont enterprise, the powder works of Eleuthère I. du Pont de Nemours. She settled in Philadelphia by 1813 and placed her children Sara and Maurice in school there. Family misunderstandings regarding the company’s solvency led to bitterness between Madame Bureaux de Pusy and her du Pont stepbrothers. She attempted to end her role in the company, went back to France in 1814, and filed suit against du Pont de Nemours in Delaware in 1818. Madame Bureaux de Pusy agreed to arbitration in 1822 to settle multiple suits, but the entire matter was not settled until 1826, with the assistance of Lafayette (Betty-Bright P. Low, “The Youth of 1812: More Excerpts from the Letters of Josephine du Pont and Margaret Manigault,” Winterthur Portfolio 11 [1976]: 173–212; Bessie G. Du Pont, Life of Eleuthère Irénée du Pont from Contemporary Correspondence, 12 vols. [1923–26]; Ambrose Saricks, Pierre Samuel Du Pont de Nemours [1965]; John Beverley Riggs, A Guide to the Manuscripts in the Eleutherian Mills Historical Library [1970]; Mack Thompson, “Causes and Circumstances of the Du Pont Family’s Emigration,” French Historical Studies 6 [1969]: 59–77; PTJ description begins Julian P. Boyd, Charles T. Cullen, John Catanzariti, Barbara B. Oberg, and others, eds., The Papers of Thomas Jefferson, 1950– , 34 vols. description ends , 31:94–5, 264–5, 292, 313–5; Pierre Samuel Du Pont de Nemours to TJ, 5 Sept. 1811).

On 16 May 1812 Bureaux de Pusy sent a similar letter to James Madison enclosing a letter of recommendation from Lafayette (Madison, Papers description begins William T. Hutchinson, Robert A. Rutland, John C. A. Stagg, and others, eds., The Papers of James Madison, 1962– , 31 vols.  Congress. Ser., 17 vols.  Pres. Ser., 6 vols.  Sec. of State Ser., 8 vols description ends , Pres. Ser., 4:391).