This compact volume features a new Greek edition of the Ad Diognetum with French translation, both by Enrico Norelli, and studies from four scholars on this important text, which all four assign to the late second century. Rudolf Brändle, in ‘Ad Diognetum: eine Wiederaufnahme paulinischer und johanneischer Theologie am Ausgang des zweiten Jahrhunderts’, revisits the thesis of his 1975 dissertation on the ethics of the Ad Diognetum and after nearly four decades finds need for only minor modification. Horacio E. Lona's ‘Die Christen in der Gesellschaft aus der Sicht des Ad Diognetum und des Kelsos’, imagines Celsus and the author of the Ad Diognetum on opposite sides of the same street in Alexandria, talking past each other, but delivers some insightful reflections on the Ad Diognetum's ongoing contribution. In ‘Ad Diognetum 2–4: polemics and politics’, Marco Rizzi contests the judgement that the Ad Diognetum's reference to idolatry and sacrifice is superficial or banal, and irrelevant to cultivated Greeks of the time. Rather, he argues that it was well aimed at a real social context of superstition which usually incorporated more sophisticated philosophical approaches to religion. Enrico Norelli's ‘Ramener l‘A Diognète en Asie Mineure? Une discussion de la thèse de Charles E. Hill’, is an effort to dissuade readers from the thesis that the Ad Diognetum could be a speech delivered orally by Polycarp or that it may be traced to a provenance in Asia Minor.