They Were Bodyguards
In the Byzantine Empire, there was an imperial bodyguard named the Varangian Guard which was made up of mostly Vikings. Nowadays, the Byzantine Empire would be where Turkey is. Eventually, the Norsemen began to work as mercenaries for the Empire.
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Raids
At one point, when Vikings raided Christian settlements, the invasions became extremely brutal. So much so that a lot of the monks and priests began to believe that the Vikings were sent by God to punish them for their sins.