 A group of passage graves on either side of the mouth of river Delvin, known as the Bremore/Gormanston group, is believed to mark the arrival of that culture from the Iberian peninsula and to be the precursor of later developments such as the Newgrange cluster.Legend also associates the site with the first landings of both Saint Patrick and Oliver Cromwell.During construction of a gas pipeline between Great Britain and Ireland, a 7 metre long prehistoric dugout was found just offshore at Gormanston Strand.