I am joined by friend of the show, Dr Lauren Mackay, to discuss Eustace Chapuys, whose fascinating life took him from studying near the Holy Shroud of Turin to the heart of the Habsburg and Tudor courts on the eve of the Reformation. He wrote in cyphers, spied for an emperor, and stood witness to rebellions, miscarriages of justice, and diplomatic scandals. Did this erudite clergyman really become Anne Boleyn's mortal enemy, as has been claimed? And how did he become a confidant of Emperor Charles V and Katherine of Aragon's last - and perhaps most loyal - friend?