Guest Stars Lydia McGuinness as Peggy Mahon Brian McCardie as James Connolly Steve Wall as Detective Coleman Gus McDonagh as Monsignor Mulcahy Jaelynne Wallace Ruane as Sadie Mahon Millie Donnelly as Gracie Mahon Jordanne Jones as Minnie Mahon Laurence O'Fuarain as Desmond Byrne Niamh Cusack as Nellie Cosgrave Joanne Brennan as Dr. Kathleen Lynn Ryan McAllister as Sylvester the Butler Sebastian Thommen as Michael Collins Camille O'Sullivan as Countess Constance Marklevicz Barry McGovern as Archbishop William Walsh Mark Lambert as Brigadier Blackader Keith Patrick Byrne as Barman Fred McCloskey as Sergeant McAuley Elva Trill as Miss Esme Quinn Andrei Alén as Captain Heathcote Stephen Mullan as Eamon de Valera