June 8 in History
793: The first known Viking raid takes place on Lindisfarne, a tidal island off the northeast coast of England, also known as Holy Island. The raid caused much consternation throughout the Christian west, and is often regarded as the beginning of the Viking Age.

The Anglo-Saxon Chronicle records: “In this year fierce, foreboding omens came over the land of Northumbria. There were excessive whirlwinds, lightning storms, and fiery dragons were seen flying in the sky. These signs were followed by great famine, and on January 8 the ravaging of heathen men destroyed God's church at Lindisfarne.”
However, the more popular accepted date for the attack is June 8.

Read more about the island's history at http://en.wikipedia.org/wiki/Lindisfarne