Whether in the courts, Parliament or the pub, to persuade you need proof, be that argument- or evidence-based. But what counts as proof, and as satisfactory proof, varies from culture to culture and from context to context. This volume assembles a range of experts in ancient Greek literature to address the theme of proof from different angles and in the works of different authors and contexts. Much of the focus is on the Athenian orators, who discussed the nature and kinds of proof from at least the fourth century BC and are still the subject of lively debate. But demonstration through evidence and argument and the language of proof are not limited to the lawcourts. They have a place in other literary forms, prose and verse, including drama and historiography, and these too feature in the collection. The book will be of interest to students and professional scholars in the fields of Greek literature and law, and Greek social and political history.