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According to the Royal Frankish Annals, in the year 810 Charlemagne was preparing to invade Denmark, but the death of their King Gudfred caused Charlemagne to call off the invasion.

What if Gudfred lived, and the Franks invaded Denmark?

If Charlemagne conquered Denmark, it seems possible that his successors could continue the northern campaigns and invade Scania and southern Sweden, although the farther north they go, the more marginal returns of continued conquest will diminish.

In the long-term, is it more likely that Denmark or further conquests would be attached to East Francia/Germany as a northern march, or could they become a Kingdom of North Francia?

How would the Viking Age be affected? Perhaps Christianized Danish Vikings could launch proto-Crusades in the Baltic, essentially larger Viking raids justified as holy war. Or Danes could be recruited as mercenaries for the HRE on its volatile eastern frontier.
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