The Duchy of Alba is a historical title and territory in Spain, specifically located in the region of Castile. It was established in the late 15th century and has been associated with the noble family of Alba, known for their significant influence in Spanish history. The duchy encompasses various estates and has played a role in the political and cultural landscape of the country. The title of Duke of Alba has been held by several prominent figures, including Fernando Álvarez de Toledo, a notable military leader during the Spanish Empire. The duchy is also recognized for its impressive palaces and gardens, reflecting the wealth and status of its holders throughout the centuries.