What event is taken as the beginning of the Viking Age?

the union between Dennmark and Norway
397
the raid on Lindisfarne monastery
1115
death of Horik I, the King of the Danes
339
first invasions on Baltic Sea shores
383
n 793, a Viking raid on Lindisfarne caused much consternation throughout the Christian west. The amazement of the English at the raids from the sea must have been matched by the amazement of the raiders at such (to them) vulnerable, wealthy and unarmed settlements.
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Ninjai
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