Scholars have long struggled with various and even conflicting historical narratives and definitions of Salafism (al-salafiyya), but a closer look at the history of the concept itself—rather than of the ideas for which it stands—goes a long way toward explaining the perennial confusion that has typified this religious orientation. This article examines the production of knowledge about Salafism as a conceptual construct and a typological category. It argues that although Salafi epithets have existed since the medieval period, they did not start referring to a religious concept known as salafiyya until the 1920s. By the same token, the widely accepted idea that salafiyya referred to an Islamic modernist movement in the late 19th and early 20th centuries is a historical fiction that originates with Louis Massignon. The history of Cairo's Salafiyya Press and Bookstore, however, sheds important light on the process by which the construction of Salafism took place.