The concept of Purgatory was a central tenet of late-medieval and early-modern Catholicism, and proved a key dividing line between Catholics and Protestants. However, as this book makes clear, ideas about purgatory were often ill-defined and fluid, and altered over time in response to particular needs or pressures. Drawing upon printed pamphlets, tracts, advice manuals, diocesan statutes and other literary material, the study traces the evolution of writing and teaching about Purgatory and the f