A. Hamilton Thompson, whose full name was Alexander Hamilton Thompson, was an esteemed English historian and academic, particularly renowned for his contributions to medieval history and architecture. Born on April 26, 1873, in Romford, Essex, Thompson went on to lead a prolific career that included the publication of numerous books and scholarly articles that greatly influenced the academic community's understanding of medieval structures and society. His insightful work, 'Military Architecture in England During the Middle Ages', remains a seminal text, providing an intricate examination of the development and significance of military structures within the context of medieval England. Thompson's meticulous research and scholarly approach contributed to the study of the evolution of castles and fortifications from both an architectural and a historical vantage point. A distinguished professor, Thompson served as a lecturer and later as a professor of medieval history at the University of Leeds, where he impressed upon generations of students the importance of thorough, primary-source-based historical inquiry. His literary style was characterized by rigor and precision, which was balanced by a clear and engaging narrative, making his historical analyses accessible to both his peers and the broader public interested in medieval studies. He passed away on November 30, 1941, but his legacy continues to inspire and inform scholars in the fields of history and military architecture.