Thanks to Teddy Caffrey, Noel Marry, Gordon O'Reilly and Luke Torris for the photographs on this website. 

Linn Duachaill - The Lost Viking Longphort

Viking activity in Co. Louth is documented in the Irish annals from the 820s and the foundation of a permanent settlement on the coast at Linn Duachaill, Annagassan is recorded in 841, the same year as the longphort of Dublin was established. For fifty years the longphort of Linn Duachaill was an important base from which raids were launched into the Irish interior and on Britain.  In its early phase Linn Duachaill seems to have rivalled Dublin as a Viking base on the east coast of Ireland.

The precise location of Linn Duachaill has been a matter of speculation by antiquarians, archaeologists and historians since at least the middle of the 18th century.  In 2004, archaeologists formed a research group with the aim of identifying the site.  This led to an excavation in 2010 in which three test trenches were dug. The team, headed by archaeologist Dr. Mark Clinton, excavated a defensive rampart, consisting of a deep ditch and a bank. This wall would have protected the fort on one side, while the other sides would have been protected by the River Glyde and the Irish Sea.  Among the many objects found were Viking ship rivets, hack silver, looted Irish metalwork, a Viking Hone Stone, a spinning whorl and a brooch pin. 

The site was discovered in 2010, on a flat area on the Glyde River.  The site it is very well preserved as it is located on agricultural land.  It is now recognised as being of European importance and has featured on RTE Nationwide, BBC's Newsline and has featured in newspapers and magazines across the world.

For more information please visit


All content copyright ©

  Site Map