When did Viking raids on Britain and continental Europe begin, and which raid is commonly taught as an early example?
Explanation
Raiding began in the closing decades of the eighth century, and the attack on an island monastery off the north-east coast of Britain is the case teaching accounts reach for first, because churchmen at the time wrote about it in horror. Putting the start in the eleventh century is the standard error, because by then Scandinavian activity had already run for two hundred years and had turned towards settlement and outright conquest.