I believe The Vikings were the Roman Empire/Byzantine Empire/Holy Roman Empire and were used to invade countries under the guise of being "Vikings", they created this army, what you might call today a paramilitary organization and then created myths around it, this was done so that the Roman Empire could go on invading the countries they wanted to without losing the pretence of being Godly. Invading countries just for gain, was not something the Roman Empire could do anymore as they had now started pretending to be following God and needed to pretend to show outwardly that they were following Gods rules.
Once they invaded and got power over the countries the Roman Empire then got Harald Bluetooth to get all the Vikings converted to being Roman Catholic, so all those countries that were invaded by the Viking then all come under the control of the Roman Empire. This is how controlled opposition works.
And It is no different today with the Governments of the world using or providing support to terrorist and paramilitary organizations around the world to destabilize countries to get power over them.
There is nothing new under the sun.
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