This volume is the result of a conference held at the University of Nottingham in July 2013, which focused on processes of integration in the Roman world. This meeting was a follow-up to an earlier conference, held at Manchester in 2010, which looked at processes of integration in the Roman Republic (see LCCN 2012007861). Both conferences started from the idea that, despite the amount of recent scholarship on integration in the ancient world and the impact these had on formation of identities, there are still aspects of these issues that are not fully understood.