Christine wrote 'Le livre des trois vertus' around 1405, one of the first conduct books offering class-specific guidance for women's education and autonomy.
Following the completion of The Book of the City of Ladies, Christine de Pizan produced Le livre des trois vertus (The Book of Three Virtues, also known as The Treasure of the City of Ladies) around 1405.
This practical companion piece extended the ideals of the City of Ladies into concrete, actionable advice. Unlike many conduct manuals of the era that offered generic moral guidance, Christine tailored her counsel specifically to women of different social ranks — from princesses and noblewomen to merchants' wives, servants, and peasants — addressing the distinct challenges and responsibilities each group faced.
The book covered topics including household management, financial prudence, navigating court politics, maintaining reputation, and handling widowhood — an issue Christine knew intimately from her own life after her husband's death left her to support her family.
It is considered one of the first systematic conduct books explicitly addressed to women across the social spectrum, treating them as capable agents needing practical education rather than merely moral instruction. This pragmatic, class-conscious approach to women's education and autonomy was highly unusual for its time and cemented Christine's reputation as a serious intellectual invested in women's real-world empowerment, not just abstract defense.