Léocadie Romaine Gascoin was born 1818 in Montenay, the 4th of 6 children. Her parents were middle-class farmers. Her mother died in 1822. Léocadie spent most of her early life at home taking care of her family. 1841 she became one of the first Marianites, entered the novitiate in Le Mans. She received her religious formation with the Sisters of the Good Shepherd at their monastery in Le Mans. Gascoin pronounced first vows in 1844 and the following year she was named the first Superior General of the Marianites, taking the name Mother Mary of Seven Dolors (Mère Marie des Sept Douleurs). She died in 1900 in Le Mans.