"El Grande Oriente" by Benito Pérez Galdós is a novel written in 1876. Set in Madrid during 1821, it follows Salvador Monsalud through the turbulent period of Spain's Liberal Triennium. The story blends melodrama with historical events, featuring real-life revolutionary figures and Freemasons who shaped this era. Monsalud's catastrophic adventures mirror the ultimate fate of the liberal revolution itself, as political factions clash and absolutist forces plot to regain power. (This is an automatically generated summary.)