This book is not about this later Wahhābism but, rather, about Wahhābism as it was before its taming and co-optation by the modern Saudi state. It aims to show that Wahhābism, from its emergence in 1153/1741 to approximately 1351/1932, was a distinctly militant form of Islam, one founded in a radical spirit of exclusion and confrontation that would persist for nearly two hundred years.