- 830s - 840s - 850s - 860s - - 880s - 890s - 900s - 910s - 920s
Years: 870 871 872 873 874 875 876 877 878 879
- The Danes invade England ( 870 ) and conquer East Anglia . Several battles are fought with Wessex , but then peace is made ( 871 ). The Danes go on to establish the Danelaw in other parts of England. In 876 , the Danes attack Wessex again, and in 878 king Alfred The Great of Wessex has to retreat to a single fort in the marshes of Somerset , but later that year he defeats the Danes, and England is divided in a Danish part in the northeast and a Wessex part in the south and west.
- In the southwest of England, the Cornish continue to be driven back, with their King Dungarth (or Doniert or Dumgarth) drowning in battle around the middle of the decade.
- . Harald Fairhair unites Norway .
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