In 845 the Viking king Ragnar is going to find his way into France through the Seine and the Loures rivers. Some of them are going to actually stay behind and that's going to be the Norman population and eventually the Normans are going to conquer England. It was William the Conqueror and he's the grandson of a Viking king. But this is how they make their way into Europe, into Paris along these rivers plundering and killing and taking the booty. It got so bad that Charles the Bald offered six tons of silver to the Vikings just to stop. So he gave them six tons of silver and then all the other Vikings were like, six tons of silver? That's a lot of silver.