Orrrr ....
The Vikings were Saxons that found refuge in Denmark after Charlemagne took to chopping their heads off along with their sacred trees to turn them into his kind of Christians. All with the assistance of clerics from Wessex in England like Winfrid of Crediton in Devon, known to the Church as St Boniface.
en.wikipedia.org
en.wikipedia.org
en.wikipedia.org
Widukind can be pronounced as Viking just as Ludvig can be pronounced as Louis or Louie.
In my timeline Winfrid of Crediton was hired by Charlemagne's granddad, Charles Martel in 716 who then chopped down the Frisians' Donar Oak in 723. Charlemagne continued his granddad's efforts, expanding his christianization plan against the Saxons of northern Germany.
Somewhere around 773 Charlemagne chopped down the Saxon's Irminsul tree at Paderborn and made it into a church somewhere about 783. This perturbed the local Saxons who rallied behind a leader known to history as Widukind who responded by destroying Charlemagne's new churches and priests, many of whom were from Wessex in England. Recruited, presumably, because they could speak to Widukind's Saxons of Germany. Charlemagne then spent a few years chasing Widukind who seems to have jumped over the Danewerk to take refuge among the Danes every time things got too hot. The Danewerk was a palisaded berm and canal connecting the Eider on the North Sea to the Schlei on the Baltic that has existed since before the Angles, Saxons and Frisians entered Roman Britain. Charlemagne never breached that line.. Nor did anyone else until 1864.
Charlemagne's patience ultimately wore out and he called the Saxons together at Verden in 782 and gave them the opportunity of becoming his type of Christians. Some were Christians already but they followed Constantinople and not Rome. Others worshiped the old gods. Charlemagne executed 4500 Saxons that failed to comply on the spot. Widukind was behind the Danewerk in Denmark
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In 789, seven years after the Verden Massacre, a group of Danes that became known to history as Vikings raided Poole in Dorset, Wessex's major harbour. Four years after that, in 793, the Viking Age is reckoned to have officially begun with the raid on the monastery at Lindisfarne.
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Charlemagne's priests, who wrote the histories of those days continued to insist that the Vikings were just bloody minded and had no reason to beat up on poor, defenceless Wessex priests trying to save souls for Charlemagne and Rome.