Today in class I learned that the nomenclature of history is dependent on who tells the story. In the case of the Vikings, it was their victims, the literate Christian monks, who told the brutal tale we know today. No word on if they used the term "terrorist".
Those same Vikings married slim French women and changed their name to Norman, which used to be pronounced Northmanni. Guys named Norm are forever grateful; they could have been named Rollo after the first Viko-Norman duke. (Who was given the title after signing a treaty with King Charles the Simple, who wins the Worst Name in the World contest hands down.) Instead, Rollo gave his name to Rolo caramels, for which dentists everywhere are grateful.