J.R.R. Tolkien's Middle-earth is perhaps the most captivating fantasy world ever created. His mythology and folklore continues to influence the work of writers, film-makers, musicians and artists to this day. He first conceived of the idea during the First World War, and built his world to examine the fear and courage, despair and hope that he witnessed. So how exactly did this brutal, bloody war help to shape Middle-earth? Dan is joined today by John Garth, an award-winning Tolkien biographer and author of Tolkien and the Great War, to tell us about Tolkien's life and how the conflict influenced his writing.

Produced by James Hickmann and edited by Dougal Patmore.

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