A shower of dragon-prowed longships appeared off the Northumbrian coast on June 8, 793, and Norse warriors struck the holy island of Lindisfarne with a ferocity that left the Anglo-Saxon world reeling. The raiders killed monks where they prayed, hurled others into the sea, looted the gold-laden shrine of Saint Cuthbert, and vanished before any defense could form. Scholar Alcuin of York wrote in horror that such a terror had never before been seen in Britain. The attack was not simply a crime of opportunity, Lindisfarne sat on a tidal island at the mouth of major sea routes, making it both wealthy and exposed. Scholars now treat that single morning as the opening act of the Viking Age, a 300-year epoch that would see Norse explorers and conquerors reach Byzantium, Baghdad, and the shores of North America. The raid forced European kingdoms to rethink coastal fortification, reshaped trade networks across the North Atlantic, and seeded Scandinavian DNA and culture from Ireland to Russia.