Mary Stallard looks at the life, work and faith of Henry Vaughan, poet and physician, who was born and in the Usk Valley 400 years ago, and who celebrated his native land under the guise of 'The Swan of Usk'. Vaughan lived through the troubles of the Civil War - shut out of his beloved church, living and working in a country divided by deep political divisions, and where plague was a constant threat, Vaughan's poetry is strikingly relevant to our times. Mary's guests include Professor Helen Wilcox, Dr Mervyn Bramley, and Dr Elizabeth Siberry.