What was the principal residence and office of the British monarchs during Tudor dynasty?

Hi Astrid,
It was filmed in Ireland. According to The Tudors Wiki site “All four seasons of “The Tudors” used Ardmore Studios, Luggala, Killruddery House and Gardens, Christchurch Cathedral in Dublin, Christ Church, Humewood Castle, Swords Castle, Drimnagh Castle and Powerscourt Estate in County Wicklow, Ireland”.