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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". This is a premium piece of content available to subscribed users.

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

My favourite place: the Peloponnese, Greece