The son of lace merchant Louis Moitessier and his wife, Françoise, née Blehée, Paul Sigisbert Moitessier married Marie-Clotilde-Inès de Foucauld [1821-1897], twenty-two years his junior, on 16 June 1842 in Mirecourt, Vosges. The couple had two daughters, Clotilde-Marie-Catherine [1843-1914], later Comtesse de Flavigny, and Françoise-Camille-Marie [1850-1934], later Vicomtesse Taillepied de Bondy. In August 1856 he received a Doctor of Law degree in Paris. When requesting a copy of his marriage certificate in December 1874, Sigisbert Moitessier gave his occupation as "banker [banquier]", and his address as "Rue d'Anjou no. 42, Paris." He was named "Procureur général" to the appellate court at Chambéry on 21 December 1877; by then he was seventy-eight years old. Moitessier died in Paris in 1889. His wife had been the subject of two portraits by the painter Jean-Auguste-Dominique Ingres (now in the National Galleries at London and Washington, D.C.). The portraits came into the possession of each of their daughters in succession, and then in turn were passed down to the younger daughter's son François, Comte Taillepied de Bondy, before they were sold.
Naef, Hans. "New material on Ingres's portraits of Mme Moitessier." The Burlington Magazine 111 (March 1969): 149-150.