1048

Events 
 The city of Oslo is founded by King Harald Hardrada of Norway.
 Battle of Pasinler – Seljuks defeat a force of Byzantines and Georgians.
 Pope Benedict IX is driven out of Rome, ending his third and final pontificate.
 Births 
 May 18 – Omar Khayyam, Persian poet and mathematician (died 1134)
 date unknown
 Michael IX Comneus, Byzantine emperor (died 1088)
 Pope Paschal II (died 1118)

 Deaths 
 Pope Damasus II (born 1000)