Historical Events in 891 AD Sep 1 Northmen defeated near Louvaine, France Sep 14 Stephen V ends his reign as Catholic Pope Oct 6 Formosus begins his reign as Catholic Pope Famous People Who Died in 891 AD Feb 6 Photius, Byzantine theologist/patriarch of Constantinople/saint, dies Sep 14 Stephen V [VI], Italian Pope (885-91), dies 889 AD History by Year 892 AD