* Earlier versions of this paper have been delivered at the Greek seminar at Lund University, the Kyknos seminar at University of Wales, Lampeter, at the 13th Congress of the FIEC in Berlin, and at the Scientists and Professionals in the Ancient World conference at the University of St Andrews. I wish to thank participants at the various venues for questions, comments and suggestions – none mentioned, none forgotten. Special thanks are due to Ewen Bowie for reading an early draft of parts of the paper. For funding a year at Corpus Christi College, Oxford during which I did the research for this paper, I am grateful to Sven och Dagmar Saléns Stiftelse.