A critically acclaimed historian of France and French culture identifies the moment in modern history when informality and comfort first became priorities, causing a sudden transformation in the worlds of architecture and interior decoration that would last for centuries.

Today, it is difficult to imagine a living room without a sofa. When the first sofas on record were delivered in seventeenth-century France, the result was a radical reinvention of interior space. Symptomatic of a new age of casualness and comfort, the sofa ushered in an era known as the golden age of conversation as the first piece of furniture designed for two, it was also considered an invitation to seduction. With the sofa came many other changes in interior space we now take for granted: private bedrooms, bathrooms, and the original living rooms.

None of this could have happened without a colorful cast of visionaries--legendary architects, the first interior designers, and the women who shaped the tastes of two successive kings of France: Louis XIV's mistress Madame de Maintenon and Louis XV's mistress Madame de Pompadour. Their revolutionary ideas would have a direct influence on realms outside the home, from clothing to literature and gender relations, changing the way people lived and related to one another for the foreseeable future.