Javier Fernández Sebastián's outstanding book, Historia conceptual en el Atlántico ibérico: lenguajes, tiempos, revoluciones, is already an essential reference for all those interested not only in conceptual history or the history of Ibero-American societies, but also in reflecting on history itself, as well as on the dilemmas and challenges involved in its writing. Its text is the fruit of a seasoned and remarkably erudite intellectual trajectory, which expresses the successful endeavour of uniting the theoretical, methodological, and empirical dimensions in the historian's work. This bid is unambiguous in the structure of the book, as well as in the divisions and linkages among its sections and chapters, and is embodied in its very narrative and in the way it unfolds.