Final answer:
During the early Middle Ages, the Vikings were significant actors in various regions, leading to political unrest.
Explanation:
The Vikings, originating from Scandinavia, troubled various regions during the early Middle Ages. They raided northern Europe, including England, and established settlements in places like Normandy, Iceland, and Kiev. Their impact, alongside other invading forces, led to the disintegration of the Carolingian Empire.
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