Françoise-Cécile (
nickname "Fanny") Messageot, was born on 22 November 1782 in Lons-le-Saunier. She was the daughter of Jean Joseph Messageot, a cavalry officer who became a postmaster, and Marie-Françoise Clerc. She had an older sister,
Lucile, who became a painter, and a twin brother, François-Xavier. Her mother remarried Claude-Antoine Charve, a judge at the Lons-le-Saunier court. From this second marriage, Louis, Tercy's half-brother, and Liberté-Constitution-Désirée (1790–1856), a half-sister who married
Charles Nodier, were born. Tercy spent her childhood in Lons-le-Saunier. Judge Charve was imprisoned in 1793 at the Cordeliers prison where he met Anne-François Tercy (1775–1841), playwright and
"man of letters", also imprisoned; he was Fanny's future husband. They married on 11 September 1814. After the wedding, the couple went to
Paris and were very close to Charles Nodier. He encouraged Fanny Tercy to write. Unable to stand her husband any longer, she left him in 1824. To prepare for her ''La Dame d'Oliferne'' (1829), Tercy walked from the town of
Arinthod to the old Oliferne castle. ==Later life and death==