[devnull255]

Sounds to me like Viking is as Viking does. Raiding and pillaging still inflicts the same result on victims whether carried out under a monarch's banner or by independent agents. Maybe use of his word describing where the pillaging and plundering was happening is similar to why the word 'typhoon' and 'hurricane' is used to describe the same meteorological phenomenon. It depends on where it is happening. Use of the word in history will also depend on the perspective of who is telling the history, whether you identify with the conquerors or the conquered. Alexander the Great to western historians is Alexander the Accursed to the Persians.