In this episode, we look at the life, legacy and ideas of one of the most influential philosophers in human history, Plato, as we get to the heart of how we debate with each other. Featuring: Mary Margaret McCabe, Professor of Ancient Philosophy Emerita, King’s College London; Catherine Rowett, Emeritus Professor, School of Politics, Philosophy and Area Studies at the University of East Anglia; Dr David Horan, Irish Centre for Platonic Studies at Trinity College Dublin; and Prof Angie Hobbs, Professor of the Public Understanding of Philosophy Emerita at the University of Sheffield.

Featuring: 'The First King of England: Æthelstan and the Birth of a Kingdom' by David Woodman, Professor and Fellow in History at Robinson College, University of Cambridge; 'Queer Georgians', by historian Dr Anthony Delaney; 'Ireland: Mapping The Island', with Joe Brady, co-author; and Changing Ireland at the National Museum of Ireland, with Dónal Maguire, Keeper of Art & Industry collections, and Sandra Heise, Curator of Historical Collections.

On its 220th anniversary, we're debating The Battle of Trafalgar, as we find out about strategy, sacrifice and victory on the high seas.

Featuring Dr Katherine Gazzard from Royal Museums Greenwich, Dr Ciarán McDonnell, historian of 18th century war and society, and Prof Andrew Lambert, Professor of Naval History at King’s College London.

On the 250th anniversary of the start of the American Revolution, we'll discuss the Irish involvement in the conflict and the impact it had on our history.

Featuring: Prof Finola O'Kane Crimmins, Professor at the School of Architecture, Planning and Environmental Policy at UCD; Dr Joel Herman, Research Fellow at the Virtual Record Treasury of Ireland, History Department at Trinity College Dublin; Prof Patrick Griffin, Madden-Hennebry Professor of History at the University of Notre Dame, and Bye-Fellow at St Edmund's College at the University of Cambridge; and Prof Eliga Gould, Harmsworth Professor of American History at Oxford.

We explore Ireland's journey through science, engineering, technology and mathematics over the last four centuries.

Featuring Dr Eoin Kinsella, managing editor of the Dictionary of Irish Biography; Prof Jane Grimson, a Member of the Royal Irish Academy and past president of Engineers Ireland and of the Irish Academy of Engineering; and Turlough O’Riordan, online and digital editor of the Dictionary of Irish Biography.

In this episode: Dublin’s Industrial Heritage by Rob Goodbody; the Voices of the Showmen exhibition at the University of Galway; The Great Reversal - Britain, China and the 400-Year Contest for Power, by Kerry Brown; and Irish settlers’ roles in Native American history, in Éire agus Na Chéad Naisiúin on TG4, with producer Ronan McCloskey.

We assess the life and legacy of US Supreme Court judge Ruth Bader Ginsburg on the fifth anniversary of her death.

Featuring: Kelsi Brown Corkran, Supreme Court Director at the Institute for Constitutional Advocacy and Protection and a Senior Lecturer at Georgetown Law; Prof Aoife O'Donoghue, Professor at the School of Law at Queen’s University Belfast; and Prof David Kenny, Head of the School of Law, Trinity College Dublin.

In this episode, we're exploring how individuals experience history, and how lives are lived against the backdrop of conflict and revolutions.

Featuring: Prof Dónal Hassett, Professor of History at Maynooth University; Dr Clodagh Tait, Lecturer in History at Mary Immaculate College; and Prof M’hamed Oualdi, Chair in European History, 19th and early 20th centuries, European University Institute.