"The Discovery Programme, a Dublin-based public institution for advanced research in archaeology, is to investigate Ireland’s interactions with the empire and with Roman Britain, aiming to fill gaps in the story of the Irish iron age, the first 500 years after the birth of Christ." Source: Irish Times.
Note: The famous Bog People are believed to date back to this period. They seem to have been ritually sacrificed. (Kings were apparently also sacrificed). For more information on the period, see the Irish History in Maps.