Pérez Galdós’s Literature as a historical source offers new horizons of understanding, expansion and deepening. Trafalgar (1873) reveals environments, biographical characters and emotions, not only the facts. The story as communication unites epic and lyrical and leads us to a new research method. As Jacques Le Goff put it, there is an external and an internal history, a psychological history, a motor that activates the individual and collective events that make up the historiology of which Ortega spoke or the anthropological-historical method according to Caro Baroja and Morales Moya. Trafalgar is the example of a transcendental fact, myth and symbol of a defeat, which opens the Galdosian story and memory of this contemporary history. Concepts such as heroism, homeland, honor, decadence in that transition from the old to the new regime make it essential, from that little-known double perspective.