Within France, the expression "duty of memory" (devoir de mémoire) speaks to a complex and ever-evolving relationship with the past. Emerging in the 1970s, this term raised questions about memorialization which dominated public debates in the 1990s, highlighting France's entanglements with colonialism and the Holocaust. Drawing on a variety of interviews, archival sources, and data surveys, author Sébastien Ledoux spotlights how the trajectory of this term offers a lens for understanding contemporary societies' relationship with the past on a global scale.