Ugo Zilioli is Leverhulme Researcher at the Faculty of Theology and Religion at the University of Oxford and Associate Member of Lady Margaret Hall, UK. His main publications include: Protagoras and the Challenge of Relativism (Ashgate 2006; reprinted for Routledge 2016), The Cyrenaics (Acumen 2012; reprinted for Routledge 2014) and as editor, From the Socratics to the Socratic schools (Routledge 2015).