Marie Dentière was born in Tournai, Flanders (now Belgium), the daughter of a noble family. She entered a Roman Catholic convent as a nun and rose to become prioress, but left to join the Reformation in 1521. She fled to Strasbourg, where she married Simon Robert, a former priest. They moved to Switzerland, where they preached and had several children. After the death of her first husband, she remarried to Antoine Froment in 1533 and went with him to Geneva. A political-religious pamphlet entitled La guerre et deslivrance de la ville de Genesve (War and Deliverance of the City of Geneva), published anonymously in 1536, has been attributed to her. In 1539, she wrote an open letter to Marguerite de Navarre called Epistre tres utile, advocating a greater role for women in the Protestant church. Local authorities seized and destroyed most of the copies and the printer was imprisoned. She fell into obscurity until being rediscovered by 19th-century historians.