This museum is dedicated to the history and works of Marie-Euphrasie Pelletier, who founded an order of nuns devoted to caring for women and children in distress. She was born into a family that had been exiled by the French Revolutionaries, which may have informed her later work devoted to refugees. She became a nun at age 18 and, by age 29, she was the highest-ranking in the convent. She went on to found her own order, and oversaw its expansion to hundreds of convents all around the world (including the US). Her ability to get things done in the face of obstacles led her to become known as "the only man of Angers."
Before visiting, make sure to check the schedule on the museum website directly. We wandered in only to find out it was closed. But in true Angevin fashion, they called the tour guide at home and it happened there was a group visiting later that afternoon and we were allowed to tag along for the very warm and informative tour. I'm not sure if they also provide tours in English on days when they're open but they have materials and signs in English.