Guest Stars Lydia McGuinness as Peggy Mahon Brian McCardie as James Connolly Steve Wall as Detective Coleman Jordanne Jones as Minnie Mahon Millie Donnelly as Gracie Mahon Jaelynne Wallace Ruane as Sadie Mahon Gus McDonagh as Monsignor Mulcahy Barry Keoghan as Cormac McDevitt Niamh Cusack as Nellie Cosgrave Laurence O'Fuarain as Desmond Byrne Marcus Lamb as Patrick Pearse Michael Feast as Sir Matthew Nathan Ryan McAllister as Sylvester the Butler Jason Cullen as Peter Mahon Jack Shepherd as General William Lowe Lalor Roddy as Thomas Clarke Sean Fox as Sean McDermott Jane Herbert as Greta the Maid Stefan Dunbar as Corporal Stewart Sebastian Thommen as Michael Collins Barry McGovern as Archbishop William Walsh Charlie Kelly as Fusilier O'Hanlon Edwin Mullane as Brophy the debt collector Keith Patrick Byrne as Barman James Craze as 'Blimey' O'Connor Norma Sheahan as Sister Patrick Ian Toner as Lieutenant Mick Mallone Hilary Anne Vesey as Woman at Tenements Patrick Buchanan as Captain Bowen-Colthurst Manus Halligan as Nottinghamshire Soldier