1043 Battle of Lyrskov hede

Magnus the Good with the axe "Hel"

Denmark
A large Wendic army crossed the Eider and plundered Southern Jutland. King Magnus the good landed a Danish/Norwegian army at Hedeby and on Saint Mikhaels day the 28th September attacked the Wends at Lyrskov hede where the Wends was crushed in a bloody battle. 

 

Before that Magnus the good had also destroyed Jomsborg, because the mercenary soldiers would not recognize him as their king.

Kaupmmannahafn(Copenhagen) was mentioned in the Icelandic Sagas
England
On the 3rd of April Edward the Confessor was crowned King of England at Winchester Cathedral.

Rus-Byzantine war

Greece
A Rus fleet was destroyed by Byzantines in the last attack on Constantinople. Survivors attempted to return home overland but was captured or killed at Varna. The raid was started by Yaroslav I of Kiev after a Rus trader was killed in Constantinople and led by his eldest son, Vladimir of Novgorod.

Italy
2 brothers from Normandy, William Iron Arm and Drogo de Hauteville, grabbed the power in Apulia.

Norway

Hallvard Vebjørnsson, a son of a local noble in the district of greater Lier, was murdered while  trying to defend a thrall woman from angry men who accused her of theft. The Catholic church approved his action, and recognised him as a martyr and canonized him as Saint Hallvard, the patron saint of Oslo.