This book investigates the historical evolution of authority and power structures, particularly within Western political thought. Walter Ullmann, a distinguished historian, examines how concepts of governance, sovereignty, and legitimacy have been shaped and contested across different eras. The work draws upon a deep engagement with primary sources and philosophical texts to trace the development of these ideas from antiquity through to the medieval period and beyond. It seeks to provide a comprehensive understanding of the theoretical underpinnings of political power.

Walter Ullmann's "Authority and Power" is recognized as a significant scholarly contribution to the history of political thought. Scholars have noted its rigorous analysis and comprehensive scope, particularly its detailed examination of medieval political theory. The book is often cited for its insightful exploration of how concepts of authority have evolved and been debated throughout Western history. Its dense academic style makes it a valuable resource for specialists and advanced students in history and political science.