In this essay, we call for a new approach to representative assemblies of early modern Europe and beyond. While there are vast national historiographies on their legal constitutional structure, little effort has been made to reconstruct the cultural and transnational dimension of such bodies, a phenomenon we describe as ‘parliamentary culture’. We argue that there is much to be gained from an investigation of the culture surrounding these bodies- how they influenced and shaped political behaviour and were shaped by it, and how they were embedded into the thought of their time and period- and from seeing them as part of a set of common European traditions of political negotiation and consent. We suggest an interdisciplinary and collaborative agenda for that investigation that might lead beyond Europe too, into some of its colonies, where Europeans also encountered other traditions of negotiated discussion and agreement.