The Treasure of the City of Ladies (Le trésor de la cité des dames, also known The Book of the Three Virtues) is a manual of education by medieval Italian-French author Christine de Pisan. Finished, like her previous The Book of the City of Ladies, by the year 1405, and dedicated to Margaret of Burgundy at a time when Christine was writing works for Margaret's father Duke John the Fearless of Burgundy, the book aims to educate women of all estates with advice on various topics. Her Book and Treasure are two of her best-known works, mainly due to the study of these books in modern academia. Source: Wikipedia (en)