This book examines the Birmingham riots of July 1791 as a pivotal rupture in Joseph Priestley’s intellectual and personal trajectory. It uses this moment to reassess Enlightenment culture through the pressures exerted on its ideals, tracing how external political violence and internal conceptual tensions shaped Priestley’s developing thought. The study situates his career across Britain and the early United States, analysing how his encounters with theology, science and political controversy informed his understanding of progress, dissent and global cultural exchange. Through its interdisciplinary approach, the book reframes Priestley’s significance within debates on Enlightenment and Romanticism. It offers a precise evaluation of the metaphors, discourses and conflicts that defined his late eighteenth-century world, providing an analytically grounded interpretation that supports contemporary research in intellectual history.