Sarah Dunant reflects on the role of history in society - and how it changes over time. Research and archaeology, as well as the views of the times in which historians live, change their perception of the past. Dunant also asks what historical fiction takes from academic study - and what it, in turn, can teach those who study the past. She also asks whether the humanities are as valued as they should be. Do we underrate them at our peril? Producer Rosamund Jones.