979 - Vikings prepared new raids

Viking gold jewelry found at Hornelund near Varde
Good rulers had in a period secured internal and external peace in England, but England came into new trouble when a child was put on the throne, Æthelred the Unready - and various minor rulers in England fought for more power, this led to a weakening of the English defense and Viking long ships appeared once again.
Isle of Man
Tynwald, the parliament of the Isle of Man was founded. It is still active and is the longest continuous parliament in the world.
Isle of Man Viking age