Vikings

Norse marauders from Norway, Sweden, and Denmark who descended, in their longships, onto Europe, where they made life (child-molesting) much harder for monks everywhere.

Although the Liberal Media may tell you that it was because of over-population and society, it was clearly because they were fed godless commie propaganda by the bears (many say that the Colbear itself was descended from the Viking chieftain Harald Hardrada's own pet), of which there are many in scandinavia. These raids were collectively known as the bear uprising of 793-1066.