The longphort confirmed
In 841 AD the Annals of Ulster record the founding of Linn Duachaill alongside the founding of Dubh Linn. For most of the next thousand years its location was a guess. From 2005 to 2007 a team led by archaeologist Mark Clinton, working with the National Monuments Service and a geophysicist, surveyed fields above Annagassan and picked up patterns of straight ditches that did not match the round ringforts of the native Irish. In 2010 a confirming dig went in. They found a defensive ditch and an earth rampart, a honestone, ironwork, animal bone - the signature of a Viking ship-camp. Mark Clinton's report sits in the Royal Irish Academy. The site is on private farmland but well-signed from the village; an interpretive panel above the strand walks you through the dig.