This review brings together new research in three areas of Anabaptist studies and the Radical Reformation. Part One focuses on sixteenth-century Anabaptism, re-examining the 'polygenesis model' of Anabaptism articulated by Stayer, Packull and Depperman. Part Two deals with the connections between Anabaptists and other Reformation dissenters, their marginalisation as social groups and their relations with the intellectual movements of the age. The final section addresses historiographic and comparative issues of writing the history of marginalised groups, investigating some preconceptions which influence historians' approaches to Anabaptism and their implications for understanding other religious groups.