In this episode: Nationalist Michael Davitt and how he inspired reform movements around the world; the aristocrat who became a champion of Catholic emancipation; and the history of intelligence. Featuring Ciara Daly, curator of the Michael Davitt exhibition at Trinity College Dublin; Síle McGuckian, author of Anglesey in Ireland, 1828-1833: Worse Than War; and Dr David Brydan, King's College London historian.

In this episode, the 125th anniversary of the birth of Brendan Bracken, the Irish born adventurer who became Winston Churchill's greatest supporter, with biographer Charles Lysaght; the 400 year fight to end slavery in the Americas, with historian Carrie Gibson; and treasure and ghosts in the London clay, with author Victoria Shepherd.

We're looking at the life and legacy of one of the American Revolution's greatest villains, Benedict Arnold, and we'll find out how his name became synonymous with treachery and betrayal. Featuring: Dr Eliga Gould, Harmsworth Professor of American History at Oxford; Dr Tom Sebrell, history lecturer at University College London; Dr Charlene Boyer-Lewis, professor of history and director of American Studies at Kalamazoo College, Michigan, and author of the upcoming ‘Traitor, Wife: Peggy Shippen Arnold and Revolutionary America’; and Emma Parry, author of the upcoming novel ‘Mrs Benedict Arnold’.