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866: Vikings establish a Kingdom in York.
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The Viking Age (793–1066 AD) was the period during the Middle Ages when Norsemen known as Vikings undertook large-scale raiding,
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791 when raids begain on the brisish isles
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878-890: The Danelaw pact. The Treaty of Alfred and Guthrum is signed, defining the political split of England between Alfred and the Danes. The Old English document survives in Cambridge's Corpus Christi College.