980 - Vikings raided England again after 25 years pause.

Denmark
The Viking ring castle Trelleborg was build in Denmark.
England
Viking incursions began in England again. Widespread viking raids from Ireland and Man in England until 990.Hampshire and the Isle of Thanet are raided.
Ireland
The Battle of Tara between Southern Uí Néill and the Kingdom of Dublin ended with a devastating defeat for the Kingdom of Dublin.The loser Óláf  Kvaran Sigtryggsson abdicated and died on Iona. Dublin was besieged by Máel Sechnaill, who forced Dublin to free all Irish thralls and deliver valuable goods, as well as give up all claims to Uí Néill held territory.
Norway
Barden or Jernbarden (‘The Iron Beard’), Earl Erik’s ship, was built between 980 and 990, collided Ormen Lange during the battle of Svolder.
Normandy
Tancred de Hauteville was born his 3 sons later conquered Southern Italy.
Russia
The reign of Vladimir I(Saint Vladimir)(958-1015) the first Christian duke of Kiev. He made orthodox Christianity the official religion of the Russian people. Haakon Sigurrdson king of Norway was allied.
Sweden
Eric the victorious became king of Sweden until 995. Olof Skötkonung, king of Sweden was born.
Wales
Gofraid mac Arailt entered an alliance with king Cystennin ab Iago of Gwynedd to support Cystennin against Hywel ab Ieuaf, who was attempting to capture the Gwynedd throne for himself. The combined Welsh-Danish force devastated Anglesey and continued pillaging until Hywel's troops confronted them in the Battle of Hirbarth,Gwaith where Cysteinn was killed.

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