In La Diplomatie byzantine, de l'Empire romain aux confins de l'Europe (Ve-XVe s.), twelve studies explore from novel angles the complex history of Byzantine diplomacy. After an Introduction, the volume turns to the period of late antiquity and the new challenges the Eastern Roman Empire had to contend with. It then examines middle-Byzantine diplomacy through chapters looking at relations with Arabs, Rus'and Bulgarians, before focusing on various aspects of the official contacts with Western Europe at the end of the Middle Ages. A thematic section investigates the changes to and continuities of diplomacy throughout the period, in particular by considering Byzantine alertness to external political developments, strategic use of dynastic marriages, and the role of women as diplomatic actors. Contributors are are Jean-Pierre Arrignon, Audrey Becker, Mickaël Bourbeau, Nicolas Drocourt, Christian Gastgeber, Nike Koutrakou, Élisabeth Malamut, Ekaterina Nechaeva, Brendan Osswald, Nebojša Porčić, Jonathan Shepard, and Jakub Sypiański.