C. D. N. COSTA is Professor of Classics and Chairman of the School of Antiquity at Birmingham University. His main research has been writing commentaries on the world of Seneca, Letters, Dialogues and the tragedy Medea, and he has also edited Lucretius V and a book of essays on Horace. Some of his translations of Seneca's Letters have been given broadcast readings by Paul Scofield on BBC Radio 3.