The "Count of Castile" was a noble title in medieval Spain, specifically associated with the region of Castile. The title emerged in the 9th century and was held by various rulers who governed the area, playing a significant role in the formation of the Kingdom of Castile. The counts were responsible for local administration, military leadership, and the defense of their territories. Over time, the title evolved, and the Counts of Castile became influential figures in the broader political landscape of Iberia. The title eventually contributed to the rise of the Kingdom of Castile, which later merged with the Kingdom of León to form a powerful kingdom that shaped Spanish history.