| TTim CampbellSelf - Director of the Saint Patrick Centre | Self - Director of the Saint Patrick Centre |
| EElva JohnstonSelf - School of History, University College Dublin | Self - School of History, University College Dublin |
| CCharles DohertySelf - School of History and Archives, University College Dublin | Self - School of History and Archives, University College Dublin |
| TThomas O'LoughlinSelf - Author: Discovering Saint Patrick | Self - Author: Discovering Saint Patrick |
| BBilly SwanSelf - Catholic Author: The Experience of God in the Writings of Saint Patrick | Self - Catholic Author: The Experience of God in the Writings of Saint Patrick |
| HHenry HullSelf - Dean of Down Cathedral, Church of Ireland | Self - Dean of Down Cathedral, Church of Ireland |
| EElizabeth DawsonSelf - Lecturer at Queen’s University Belfast | Self - Lecturer at Queen’s University Belfast |
 Gordon RobertsonSelf - President of the Christian Broadcasting Network | Self - President of the Christian Broadcasting Network |
 John Rhys-DaviesOld Patrick | Old Patrick |
 Seán T. Ó MeallaighPatrick | Patrick |
 Robert McCormackYoung Patrick | Young Patrick |
 Moe DunfordSelf - Narrator (voice) | Self - Narrator (voice) |
| MMalcolm AdamsBritish Bishop | British Bishop |
 Shane CaseyCalpornius / Druid | Calpornius / Druid |
| TTerry ByrnePotitus | Potitus |
 Jed MurrayCaptain | Captain |
 Shane O'ReganYoung Felix | Young Felix |
| AAdam TraynorFelix | Felix |
| HHugh KirwanIrish King | Irish King |
 Ailbhe CowleyVirgin | Virgin |
 Joe PurcellKing of Tara | King of Tara |
| RRachael RussellPatrick's Mom | Patrick's Mom |
| TTom LeaveyMentor | Mentor |
| SStephen SheridanTribal Leader's Son | Tribal Leader's Son |
| WWilliam Howard LynchElderly Bishop / Druid 3 | Elderly Bishop / Druid 3 |
| TTrevor Edward JonesIrish Man | Irish Man |
| BBryan SmithVictoricus | Victoricus |
| DDerek BlackSlave Owner | Slave Owner |
| CChris ShawBusinessman | Businessman |
| JJohn HeathwoodSlaver | Slaver |
