"According to the fifteenth century history work The Annals of Ulster, the Vikings started wreaking havoc on Ireland in 795, but eventually they settled down enough to found a couple outputs, Dúbh Linn and Linn Duchaill. The ultimate fate of Linn Duchaill had been an archaeological mystery for centuries, until last week's announcement that the settlement had been found 45 miles north of Dublin in the village of Annagassan.
The people of Annagassan have long possessed a rich oral tradition of Viking raids and a nearby lost settlement. This story has been backed up by occasional small discoveries, like ancient handcuffs the Vikings would have used on their slaves. All this was enough to convince local filmmaker Ruth Cassidy to enlist the help of archaeologist friend Mark Clinton to find the lost outpost."