The pax was an object intended both to symbolise and to enforce peace among Christian congregations in pre-modern Europe and so when a man named John Browne smashed one over the head of the parish clerk during one of the holiest services of the year in a church in southeast England something had evidently gone wrong. This article is dedicated to explaining not only why Browne reacted with such fury at precisely the moment when he was expected to do the opposite but also why the pax and the clerk were chosen as his victims. The pax's material and visual qualities are integral, and overlooked, parts of this story but it is only by relating them to its representational and institutional contexts that Browne's actions begin to make sense. By integrating the material and the semiotic in this way, this article posits a conceptual structure for explicating not only an important dimension of the relationship between materiality, representation and affectivity but also how such relationships can, indeed must, be historicised to particular objects, ideologies and institutions.