The Vikings of Waterford have erected stone…

The Vikings of Waterford have erected stone fortifications in the shape of an isosceles triangle, at the apex of which is the structure known as Reginald’s Tower, constructed in 1003. (After performing numerous functions over the years it is today is a civic museum. It is Ireland’s oldest urban civic building, and the oldest monument to retain its Viking name. To this day, it remains Waterford's most recognizable landmark. It is believed to be the first building in Ireland to use mortar.)