‘Identity is Now Seen Not as an Eternal given, but as something actively constructed and contested in a particular historical context, based on subjective, not objective criteria.’ For all that it may be a contingent construct, identity is a powerful driver of action, as we know all too well from our own experience. Identity matters. Coins have been described, in the words of Fergus Millar, as ‘the most deliberate of all symbols of public identity’. Yet the Roman historian will look in vain for any good introduction to, or systematic treatment of, the subject. That, in a nutshell, is the need which this volume seeks to address. It is worth emphasizing the words deliberate and public. It is relevant to recall the late second-century BC inscription which states the reasons why the people of Sestus decided to use its own bronze coinage. The first reason given is so that the city’s coin type should be used as a current type. In this context at least, coins were seen as a deliberate advertisement of public identity. What coinage most obviously provides is an enormous range of self-defined and explicit representations of public/official/communal identities, principally civic in nature. The material thus largely allows us to avoid the thorny problems associated with externally defined, implicit, and private identities. A public medium like coinage is not the place to look for overt opposition to Roman rule. And it invites, rather than answers, the question of to what extent public identities might have been understood as covert ‘resistance’ to Rome, to what extent they represented a self-definition designed to accommodate or play up to Roman attitudes, and to what extent they may even have been inspired or promoted by Rome itself. Identity has been a major focus of research in recent decades, for the obvious reason that it is particularly an issue when under threat. That consideration applies as much to our own scholarly context as it does to our subject, the Roman empire. The advent of the Euro has inevitably drawn attention to money in this context. Naturally there are major differences between now and then.