Guest Stars Lydia McGuinness as Peggy Mahon Brian McCardie as James Connolly Steve Wall as Detective Coleman Jordanne Jones as Minnie Mahon Gus McDonagh as Monsignor Mulcahy Millie Donnelly as Gracie Mahon Jaelynne Wallace Ruane as Sadie Mahon Barry Keoghan as Cormac McDevitt Laurence O'Fuarain as Desmond Byrne Michael Feast as Sir Matthew Nathan Marcus Lamb as Patrick Pearse Joanne Brennan as Dr. Kathleen Lynn Jason Cullen as Peter Mahon Ruairí Heading as Fusilier McGarry Stefan Dunbar as Corporal Stewart Jane Herbert as Greta the Maid Jack Shepherd as General William Lowe Kieran O'Reilly as Captain Robert Barton Ann Skelly as Biddy Lambert Charlie Kelly as Fusilier O'Hanlon Barry Barnes as Constable James O'Brien John Connors as Michael Molloy Adrian Hudson as Lofty Lloyd Charlie Bonner as William Wylie Jack Hickey as Sean Connolly Faolan Morgan as Tall Fusilier Fintan Phelan as Driver Terry O'Neill as Looting Man Paul Kealyn as ICA Man Emer O'Grady as Housewife Stephen O'Brien as Volunteer Graham Dodd as Van Driver Dylan Kelly as ICA Man 2 Rory Corcoran as Dying Man Eemeli Louhimies as Milo