1048

By place

Byzantine Empire

• September 18 - Battle of Kapetron: A combined Byzantine-Georgian army under Byzantine generals Aaronios and Katakalon Kekaumenos, confronts the invading Seljuk Turks, led by Ibrahim Inal, at Kapetron. The Byzantines defeat their opposing Turkish forces in the flanks, but in the centre Ibrahim Inal captures Liparit, and is able to safely withdraw the Byzantine territory, laden with spoils and captives, including Liparit.
• Winter - Emperor Constantine IX sends an embassy with gifts and a ransom, for the release of Liparit IV to Tughril. However, the sultan sets Liparit free, on condition that he will never again fight the Seljuks.

  Europe

• Winter - Emperor Henry III appoints his cousin, Bishop Bruno of Toul, as successor of Damasus II at an assembly at Worms.
• The city of Oslo is founded by King Harald III of Norway.

  England

• 1048 or 1066 - End of the Viking Age: Vikings make an unsuccessful raid on the Kingdom of England; The raiders flee to Flanders.
• King Edward the Confessor goes to war against Flanders, blockading the English Channel with a fleet based at Sandwich in Kent.

  By topic

Religion

• July 16 - At orders of Henry III, German troops under Boniface III, enter Rome and expel Pope Benedict IX.
• July 17 - Pope Damasus II succeeds Benedict IX as the 151st pope of the Catholic Church, but he dies after 23 days.