This book explores the enduring political philosophy of Lord Bolingbroke, a central figure in early 18th-century British thought whose critiques of government corruption, party factionalism, and the role of monarchy in constitutional systems have had a lasting impact on political theory. Through a series of deep analyses, the book examines Bolingbroke's ideas on mixed government, virtue, liberty, the rule of law, and the necessity of moral leadership, situating them in both the context of his time and their later influence on the American and French Revolutions, as well as on the development of modern constitutionalism. By analyzing Bolingbroke's primary sources, including The Idea of a Patriot King and A Dissertation upon Parties, the book traces his intellectual contributions, from his opposition to Robert Walpole's corrupt administration to his vision of a balanced, virtuous government. Although Bolingbroke's specific political prescriptions were not fully realized in his lifetime, his ideas provided an intellectual foundation for later democratic and republican movements, profoundly shaping the political thinking of future generations, particularly in Britain, America, and revolutionary France. This comprehensive study highlights Bolingbroke's influence on the separation of powers, the development of checks and balances, and the importance of virtue in sustaining republicanism, ultimately positioning him as a pivotal thinker whose legacy continues to resonate in contemporary discussions about governance, political ethics, and the preservation of liberty.