This book delineates the attempt, carried out by the Congregations of the Inquisition and the Index during the sixteenth and early seventeenth century, to purge various devotional texts in the Italian vernacular of heterodox beliefs and superstitious elements, while imposing a rigid uniformity in liturgical and devotional practices. The first part of the book is focused on Rome's anxious activity toward the infiltration of Protestant ideas in vernacular treatises on prayer meant for mass consumption. It next explores how, only in the second half of the sixteenth century, once Rome's main...