This chapter reflects on various traditional approaches to the historical study of European criminal law in the nineteenth and twentieth centuries. It examines several ways of naming and framing the subject matter, along with ways of ‘covering’ it along a set of by now fairly well-established narrative paths that generally reflect a quietly reassuring Whiggishness. It then lays out an alternative, two-track, conception of ‘modern’ European criminal legal history. It does this by taking an upside-down—or outside-in—view of the subject, by focusing on an understudied, but fascinating, project of European criminal law: the invention, implementation, and evolution of colonial criminal law.