This book presents an informative and thorough analysis of one of the most convulsive periods in Spanish history, exploring the paradoxical military victory and political defeat of Carlism. Moving away from conventional interpretations, the author questions the idealized vision of the Second Republic, portraying it not as an era of progress, but as a period marked by deep social divisions and political conflicts, revealing how the inability to establish a solid democratic project led to a growing polarization that would lead to the tragic outcome. This book rigorously examines the role of Carlism during the Republic and its subsequent fate. Despite their decisive participation in the uprising, the defenders of the slogan "Dios, Patria, Rey" (God, Fatherland, King) would see their military victory transformed into a bitter political defeat. The new totalitarian and centralist State would not only ignore the Carlist ideology, but would end up dismantling its regionalist and foral structure, culminating in its unification-absorption by the Falange in 1937. The author sheds light on a fundamental chapter of our recent history while unraveling the complexities of political power and the price of victory in times of radical change. Del Burgo provides fundamental keys to understanding the contradictions that defined this crucial period of Spanish history. Jaime Ignacio del Burgo, jurist and historian, has dedicated his career to the study of history and foral law. The first democratic president of the Provincial Council of Navarre and corresponding member of the Royal Academy of History, he is the author of almost fifty works on historical, constitutional and foral issues.