The Cortes of Castile was an assembly of representatives from various regions of the Kingdom of Castile in medieval Spain. It played a crucial role in the governance of the kingdom, allowing nobles, clergy, and townspeople to discuss and advise on matters such as taxation and legislation. The Cortes helped to balance power between the monarchy and the subjects. Over time, the Cortes of Castile evolved into a more formal institution, influencing the development of parliamentary systems in Spain. Its sessions were held irregularly, often summoned by the monarch, and it contributed to the political landscape of the Spanish Empire during the late Middle Ages and early Renaissance.