Melvyn Bragg and guests discuss Solon, who was elected archon or chief magistrate of Athens in 594 BC: some see him as the father of Athenian democracy. In the first years of the 6th century BC, the city state of Athens was in crisis. The lower orders of society were ravaged by debt, to the point where some were being forced into slavery. An oppressive law code mandated the death penalty for everything from murder to petty theft. There was a real danger that the city could fall into either tyranny or civil war. Solon instituted a programme of reforms that transformed Athens’ political and legal systems, its society and economy, so that later generations referred to him as Solon the Lawgiver. With Melissa Lane Class of 1943 Professor of Politics at Princeton University Hans van Wees Grote Professor of Ancient History at University College London and William Allan Professor of Greek and McConnell Laing Tutorial Fellow in Greek and Latin Languages and Literature at University College, University of Oxford Producer Luke Mulhall

Melvyn Bragg and guests discuss the pioneering Danish astronomer Tycho Brahe (1546 – 1601) whose charts offered an unprecedented level of accuracy. In 1572 Brahe's observations of a new star challenged the idea, inherited from Aristotle, that the heavens were unchanging. He went on to create his own observatory complex on the Danish island of Hven, and there, working before the invention of the telescope, he developed innovative instruments and gathered a team of assistants, taking a highly systematic approach to observation. A second, smaller source of renown was his metal prosthetic nose, which he needed after a serious injury sustained in a duel. The image above shows Brahe aged 40, from the Atlas Major by Johann Blaeu. With Ole Grell Emeritus Professor in Early Modern History at the Open University Adam Mosley Associate Professor of History at Swansea University and Emma Perkins Affiliate Scholar in the Department of History and Philosophy of Science at the University of Cambridge.

Melvyn Bragg and guests discuss A Theory of Justice by John Rawls (1921 - 2002) which has been called the most influential book in twentieth century political philosophy. It was first published in 1971. Rawls (pictured above) drew on his own experience in WW2 and saw the chance in its aftermath to build a new society, one founded on personal liberty and fair equality of opportunity. While in that just society there could be inequalities, Rawls’ radical idea was that those inequalities must be to the greatest advantage not to the richest but to the worst off. With Fabienne Peter Professor of Philosophy at the University of Warwick Martin O’Neill Professor of Political Philosophy at the University of York And Jonathan Wolff The Alfred Landecker Professor of Values and Public Policy at the Blavatnik School of Government, University of Oxford and Fellow of Wolfson College Producer: Simon Tillotson

Melvyn Bragg and guests discuss Plato's account of the once great island of Atlantis out to the west, beyond the world known to his fellow Athenians, and why it disappeared many thousands of years before his time. There are no sources for this story other than Plato, and he tells it across two of his works, the Timaeus and the Critias, tantalizing his readers with evidence that it is true and clues that it is a fantasy. Atlantis, for Plato, is a way to explore what an ideal republic really is, and whether Athens could be (or ever was) one; to European travellers in the Renaissance, though, his story reflected their own encounters with distant lands, previously unknown to them, spurring generations of explorers to scour the oceans and in the hope of finding a lost world. The image above is from an engraving of the legendary island of Atlantis after a description by Athanasius Kircher (1602-1680). With Edith Hall Professor of Classics at Durham University Christopher Gill Emeritus Professor of Ancient Thought at the University of Exeter And Angie Hobbs Professor of the Public Understanding of Philosophy at the University of Sheffield Producer: Simon Tillotson

Melvyn Bragg and guests discuss ideas of Georg Wilhelm Friedrich Hegel (1770 - 1831) on history. Hegel, one of the most influential of the modern philosophers, described history as the progress in the consciousness of freedom, asking whether we enjoy more freedom now than those who came before us. To explore this, he looked into the past to identify periods when freedom was moving from the one to the few to the all, arguing that once we understand the true nature of freedom we reach an endpoint in understanding. That end of history, as it's known, describes an understanding of freedom so far progressed, so profound, that it cannot be extended or deepened even if it can be lost. With Sally Sedgwick Professor and Chair of Philosophy at Boston University Robert Stern Professor of Philosophy at the University of Sheffield And Stephen Houlgate Professor of Philosophy at the University of Warwick Producer: Simon Tillotson