What we know about the mediaeval period comes, in large part, from what people wrote down about themselves and others. How do we find out about less-literate societies, like the Vikings? Cat Jarman has spent the last few years working on the the remains of the Great Army at Repton and the material artefacts they left behind. In her new book - River Kings she talks about the huge leaps archaeology has made with new technologies and all we can now learn from their teeth, jewellery, and even the metals of the Vikings. Welcome to Future Imperfect!

Producer: Natt Tapley

Audio: Pete Dennis

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