991
991 (CMXCI) was a common year starting on Thursday (link will display the full calendar) of the Julian calendar.
Events
By place
Europe
Battle of Maldon: The Anglo-Saxons are beaten by Viking invaders led by Olaf Tryggvason, later Olaf I of Norway.
Sweyn I of Denmark gets his throne back.
Births
Sigurd Hlodvirsson, Earl of Orkney
Abdullah Yousef, of Kuwait
Deaths
Theophanu, empress, mother of Otto III (b. 956) Emperor En' yu, emperor of Japan (b. 959)
References