865

align="center" colspan=2 | Years:
861 862 863 864 - 865 - 866 867 868 869

align="center" colspan=2 | Decades:
830s 840s 850s - 860s - 870s 880s 890s

align="center" | Centuries:
8th century - 9th century - 10th century

Events

Ethelred succeeds as king of Wessex (or 866).
Ragnar Lodbrok invades England, but is defeated by king Ella of Northumbria
A Russian expedition for the first time threatens Constantinople.
Louis the German divides his kingdom among his sons.
Lothair, threatened with excommunication, takes back his first wife,
Harald Harfagre (850-933) becomes king of Norway, the first king to rule over most of (but not all of) Norway
Bulgaria under Boris I converts to Orthodox Christianity.

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