+The year 866 marked a period of significant change across continents. In [England](/wiki/England), the [Great Heathen Army](/wiki/Great_Heathen_Army) continued its advance, while the Abbasid Caliphate saw a power shift.
+## See also
+- [Viking Age](/wiki/Viking_Age)
+- [Anglo-Saxons](/wiki/Anglo-Saxons)
+- [Middle Ages](/wiki/Middle_Ages)
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