Melvyn Bragg and his guests discuss the Physiocrats, an important group of economic thinkers in eighteenth-century France. The Physiocrats believed that the land was the ultimate source of all wealth, and crucially that markets should not be constrained by governments. Their ideas were important not just to economists but to the course of politics in France. Later they influenced the work of Adam Smith, who called Physiocracy "perhaps the nearest approximation to the truth that has yet been published upon the subject of political economy."With:Richard Whatmore Professor of Intellectual History & the History of Political Thought at the University of SussexJoel Felix Professor of History at the University of ReadingHelen Paul Lecturer in Economics and Economic History at the University of Southampton.Producer: Thomas Morris.

Melvyn Bragg and his guests discuss Queen Zenobia, a famous military leader of the ancient world. Born in around 240 AD, Zenobia was Empress of the Palmyrene Empire in the Middle East. A highly educated, intelligent and militarily accomplished leader, she claimed descent from Dido and Cleopatra and spoke many languages, including Egyptian. Zenobia led a rebellion against the Roman Empire and conquered Egypt before being finally defeated by the Emperor Aurelian. Her story captured the imagination of many Renaissance writers, and has become the subject of numerous operas, poems and plays.With:Edith Hall Professor of Classics at King's College, London Kate Cooper Professor of Ancient History at the University of Manchester Richard Stoneman Honorary Visiting Professor in the Department of Classics and Ancient History at the University of Exeter.Producer: Thomas Morris.

Melvyn Bragg and his guests discuss the Putney Debates. For several weeks in late 1647, after the defeat of King Charles I in the first hostilities of the Civil War, representatives of the New Model Army and the radical Levellers met in a church in Putney to debate the future of England. There was much to discuss: who should be allowed to vote, civil liberties and religious freedom. The debates were inconclusive, but the ideas aired in Putney had a considerable influence on centuries of political thought.With:Justin Champion Professor of the History of Early Modern Ideas at Royal Holloway, University of LondonAnn Hughes Professor of Early Modern History at Keele UniversityKate Peters Fellow in History at Murray Edwards College, Cambridge.Producer: Thomas Morris.

Melvyn Bragg and his guests discuss the work of Alfred Russel Wallace, a pioneer of evolutionary theory. Born in 1823, Wallace travelled extensively, charting the distribution of animal species throughout the world. This fieldwork in the Amazon and later the Malay Archipelago led him to formulate a theory of evolution through natural selection. In 1858 he sent the paper he wrote on the subject to Charles Darwin, who was spurred into the writing and publication of his own masterpiece On the Origin of Species. Wallace was also the founder of the science of biogeography and made important discoveries about the nature of animal coloration. But despite his visionary work, Wallace has been overshadowed by the greater fame of his contemporary Darwin.With:Steve Jones Emeritus Professor of Genetics at University College LondonGeorge Beccaloni Curator of Cockroaches and Related Insects and Director of the Wallace Correspondence Project at the Natural History MuseumTed Benton Professor of Sociology at the University of EssexProducer: Thomas Morris.

Jane Francis, Richard Corfield and Carrie Lear join Melvyn Bragg to discuss ice ages, periods when a reduction in the surface temperature of the Earth has resulted in ice sheets at the Poles. Although the term 'ice age' is commonly associated with prehistoric eras when much of northern Europe was covered in ice, we are in fact currently in an ice age which began up to 40 million years ago. Geological evidence indicates that there have been several in the Earth's history, although their precise cause is not known. Ice ages have had profound effects on the geography and biology of our planet.With:Jane Francis Professor of Paleoclimatology at the University of LeedsRichard Corfield Visiting Research Fellow in the Department of Earth Sciences at Oxford UniversityCarrie Lear Senior Lecturer in Palaeoceanography at Cardiff University.Producer: Thomas Morris.

Melvyn Bragg and his guests discuss the War of 1812, the conflict between America and the British Empire sometimes referred to as the second American War of Independence. In June 1812, President James Madison declared war on Britain, angered by the restrictions Britain had imposed on American trade, the Royal Navy's capture of American sailors and British support for Native Americans. After three years of largely inconclusive fighting, the conflict finally came to an end with the Treaty of Ghent which, among other things, helped to hasten the abolition of the global slave trade. Although the War of 1812 is often overlooked, historians say it had a profound effect on the USA and Canada's sense of national identity, confirming the USA as an independent country. America's national anthem, The Star-Spangled Banner began life as a poem written after its author, Francis Scott Key, witnessed the British bombardment of Fort McHenry during the Battle of Baltimore. The war also led to Native Americans losing hundreds of thousands of acres of land in a programme of forced removal. With: Kathleen Burk Professor of Modern and Contemporary History at University College London Lawrence Goldman Fellow in Modern History at St Peter's College, University of Oxford Frank Cogliano Professor of American History at the University of Edinburgh Producer: Victoria Brignell.

Melvyn Bragg and his guests discuss The South Sea Bubble, the speculation mania in early 18th-century England which ended in the financial ruin of many of its investors. The South Sea Company was founded in 1711 with a view to restructuring government debt and restoring public credit. The company would ostensibly trade with South America, hence its name; and indeed, it did trade in slaves for the Spanish market even after the Bubble burst in 1720. People from all walks of life bought shares in the South Sea Company, from servants to gentry, and it was said the entire country was gripped by South Sea speculation mania. When the shares crashed and the company collapsed there was a public outcry and many people faced financial ruin, although some investors sold before the crash and made substantial amounts of money. For example, the bookseller Thomas Guy made his fortune and founded a hospital in his name the following year. But how did such a financial crisis develop and were there any lessons learnt following this early example of a stock market boom and bust?With:Anne Murphy Senior Lecturer in History at the University of HertfordshireHelen Paul Lecturer in Economics and Economic History at the University of SouthamptonRoey Sweet Head of the School of History at the University of LeicesterProducer: Natalia Fernandez.

Melvyn Bragg and his guests discuss the Borgias, the most notorious family in Renaissance Italy. Famed for their treachery and corruption, the Borgias produced two popes during their time of dominance in Rome in the late 15th century. The most well-known of these two popes is Alexander VI, previously Cardinal Rodrigo Borgia. He was accused of buying votes to elect him to the papacy and openly promoted his children in positions of power. Rodrigo's daughter, Lucrezia, is widely remembered as a ruthless poisoner; his son, Cesare, as a brutal soldier. Murder, intrigue and power politics characterised their rule, but many of the stories now told about their depraved behaviour and evil ways emerged after their demise and gave rise to the so-called 'Black Legend'. The sullied reputation of the Borgia dynasty endures even today and their lives have provided a major theme for plays, novels and over forty films.With:Evelyn Welch Professor of Renaissance Studies at Queen Mary, University of LondonCatherine Fletcher Lecturer in Public History at the University of SheffieldChristine Shaw Honorary Research Fellow at Swansea University Producer: Natalia Fernandez.

Hannibal, the Carthaginian general, led his army with elephants across the Alps to attack the Roman Republic. The podcast discusses his strategic military tactics, his rise to power, the crossing of the Alps, his victories in battles, the departure of an elite unit, and his symbolic significance as a figure of fear and destruction.

Melvyn Bragg and his guests discuss the medieval scholar Gerald of Wales. Born around the middle of the twelfth century, Gerald was a cleric and courtier. For much of his life he was close to Henry II and the Church hierarchy, and wrote accounts of official journeys he made around Wales and Ireland in their service. Both Anglo-Norman and Welsh by parentage, he had a unique perspective on the political strife of his age. Gerald's Journey Around Wales and Description of Ireland are among the most colourful and informative chronicles of the Middle Ages, and had a powerful influence on later historians.With:Henrietta Leyser Emeritus Fellow of St Peter's College, University of OxfordMichelle Brown Professor Emerita of Medieval Manuscript Studies at the School of Advanced Study, University of LondonHuw Pryce Professor of Welsh History at Bangor UniversityProducer: Thomas Morris.