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In page Vikings:

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In the Viking Age, the present-day nations of Norway, Sweden and Denmark did not exist, but the peoples who lived in what is now those countries were largely homogeneous and similar in culture and language, although somewhat distinct geographically. The names of Scandinavian kings are reliably known for only the later part of the Viking Age. After the end of the Viking Age, the separate kingdoms gradually acquired distinct identities as nations, which went hand-in-hand with their Christianisation. Thus, the end of the Viking Age for the Scandinavians also marks the start of their relatively brief Middle Ages.[citation needed]