European diplomacies are characterised by widely varied practices, whether in training staff, the place of women, culture, the negotiating language they use, or in the way they construct networks and build identities. Diplomacy in Europe, which this book provides a unique history of, is firstly that of the cohabitation between small, medium, and large states, combining diplomacy of power, of trade, and of values. It is also a history of forms of cooperation that, from multinational empires to nation-states, are reconfigured into a regional framework, while coming up against the practices of other spheres. The profound contemporary transformation of diplomacy as a profession must be interpreted in light of these traditions, exposed to the increased complexity of missions, and the emergence of para-diplomatic actors. Practices specific to the European Union are slowly being put into place, yet the power relations between European states and the eminently political nature of their cultural and economic exchanges persist.