This special episode marks the 700th anniversary of the Battle of Boroughbridge and the execution of Thomas, earl of Lancaster, in 1322. This was the bloody end of a civil war that scarred one of England’s most troubled and turbulent reigns, that of Edward II. Dr Sophie Ambler is the Deputy Director of the Centre for War and Diplomacy and author of The Song of Simon de Montfort: England's First Revolutionary and the Death of Chivalry (2019); Dr Andrew Spencer is Fellow and Senior Tutor of Gonville and Caius College, Cambridge, and has published extensively on the nobility, politics and constitution of thirteenth- and fourteenth-century England; Dr Paul Dryburgh is Principal Record Specialist at The National Archives, and has been at the forefront of new research into the records and government of the era for nearly twenty years. Paul, Andrew and Sophie are part of a team of researchers – from the The National Archives and the Universities of Lincoln, Cambridge and Lancaster– involved in a new collaborative research project: ‘A State within a State? The making of the Duchy of Lancaster, c.1066-1422’.