In March 1685, Louis XIV’s final wife Madame de Maintenon wishes to set up a boarding school for young daughters of noble families that have fallen on hard times, the Maison royale de Saint-Louis, a school where girls receive a pious but liberal education. The first difficulty is that the students from the provinces all speak different regional languages and dialects and the first task is to teach them all to speak a standardised Parisian French.