The Leonese Nobility refers to the aristocratic class that emerged in the historical region of Leon, located in northwestern Spain. This nobility played a significant role in the political and social landscape of medieval Castile and Leon, often holding lands and titles granted by the monarchy. They were influential in local governance and military matters, contributing to the defense and expansion of their territories. Members of the Leonese nobility were often involved in the Reconquista, the campaign to reclaim the Iberian Peninsula from Muslim rule. They established powerful families, such as the House of Alba and the House of Osorio, which shaped the region's history. Their legacy continues to be recognized in modern Spanish culture and heritage.