Roman artifacts including coins, glass beads and brooches turn up in many Irish counties, especially in the east. Cahill Wilson investigated human remains... using strontium and isotope analysis and carbon dating. Remarkably, this allowed her say where they most likely spent their childhood. One burial site on a low ridge overlooking the sea in Bettystown, Co Meath, was dated to the 5th/6th century AD using radiocarbon dating. Most of the people were newcomers to the area, Cahill Wilson concluded. The clue was in their teeth. Enamel, one of the toughest substances in our body, completely mineralises around the age of...