This article documents the year AD 991. Events By Place Europe Battle of Maldon: The Anglo-Saxons are defeated by Viking invaders. Sweyn I of Denmark recovers his throne. Births Sigurd Hlodvirsson, Earl of Orkney Deaths Theophanu, empress, mother of Otto III (b. 956) Emperor En'yū, emperor of Japan (b. 959)… (More on 991)