Marguerite Naseau was an uneducated shepherdess who taught herself to read and began teaching other village girls. She expressed a desire to Vincent de Paul to serve the poor. He brought her to Paris and placed her under Louise de Marillac, where she readily expressed her wish to serve the poor through the Confraternity. Marguerite caught the plague from a girl she nursed and died at the Hospital of Saint Louis, with her heart filled with joy in conformity to God's will.