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Professor Dame Janet L Nelson has published extensively on early medieval Europe. She is professor emeritus at King's College London, a fellow of the British Academy and a former president of the Royal Historical Society. Her previous books include 'Charles the Bald' (1992) and 'The Frankish World' (1996). (Photograph by Frank Monks)

Books interview with Janet Nelson: "The only way this huge regime could work was by Charlemagne trusting his own instincts".

The ancient Greek theatre at Epidaurus, which boasts superb acoustics and aesthetics. (Photo by Alamy)

My favourite place: the Peloponnese, Greece