In medieval Spain, the feudal system established relationships of dependency and vassalage that defined what power meant. Dukes, who held high-ranking noble titles, often owned extensive lands and dominions that conferred considerable authority. These territories, which could range from fertile agricultural lands to strategic trading areas, were fundamental for the economic sustenance not only of their families but also of the communities living under their jurisdiction.
In the 14th century, the creation and consolidation of duchies such as Alba or Béjar marked a new paradigm in the local economy. Dukes were responsible for the administration of their territories, which involved not only tax collection but also the management of natural resources such as water, forests, and farmland. In many cases, the prosperity of a duchy depended on the duke's ability to implement effective agricultural policies. A notable example is the Duke of Alba, who throughout the 15th century promoted agriculture in his Andalusian lands, encouraging the cultivation of sugar cane and wine production. This intervention not only enriched his estate but also contributed to the economic growth of the region.
However, the role of dukes went beyond mere administration...