This book offers a comprehensive exploration of the impact and reception of Thomas Aquinas' thought from the medieval period through the Reformation and into contemporary theological and philosophical discourse. Focusing on key aspects of Aquinas' intellectual legacy, the work examines his synthesis of faith and reason, his contributions to natural law theory, ethics, metaphysics, and his conception of the Church's authority. It traces the ways in which Aquinas' ideas were both embraced and contested by Reformation thinkers, such as Martin Luther and John Calvin, who rejected many aspects of his theology but still grappled with his philosophical framework. The book further explores the Catholic Counter-Reformation's defense of Thomism, highlighting its role in shaping the intellectual and theological responses to Protestant critiques.