One June day late in the eighth century, Norse seafarers arrived at the English island of Lindisfarne. They waged a savage attack on its unsuspecting abbey, and with this, the Age of the Vikings was born. These roving pillagers spent the next few hundred years raiding and trading a path across Northern and Western Europe. Except, that's not quite true. It's just a convenient place to start the story - a story that has seen radical new discoveries over the past few years.