Olivier Hekster, Radboud University, is professor of Ancient History and chairs the international network Impact of Empire. He has published widely on Roman history, focusing on imperial ideology and Roman emperorship.Koenraad Verboven, University of Ghent, is professor of Ancient History. He specializes in ancient social and economic history, particularly of the Roman world, and has a special interest in monetary history and numismatics, friendship and patronage based networks, guilds (collegia), (neo-)institutional analysis and complexity economics.Contributors are: Olivier Hekster & Koenraad Verboven, Stephane Benoist & Anne Gangloff, Elsemieke Daalder, Francesco Bono, Matthijs Wibier, Juan, Manuel Cortés-Copete, Frédéric Hurlet, Clifford Ando, Peter Herz, Elena Köstner, Pilar Pavón Torrejón, Margherita Carucci.