The Revolt of the Comuneros was a significant uprising that occurred in Castile, Spain, between 1520 and 1522, driven by local nobility and citizens opposing the centralization of power by King Charles I. This revolt was fueled by grievances over heavy taxation, the influence of foreign advisers, and a desire for greater local autonomy. It highlights the tensions between emerging new monarchies and traditional feudal structures in early 16th-century Europe.