Battle of Lechfeld
The first documented mention of the city during the Middle Ages is within the Salzburg Annals, dating to 881, when a battle "apud Weniam" was fought against the Magyars. However, it is unclear whether this refers to the city or the River Wien. Emperor Otto I defeated the Magyars in 955 in the Battle of Lechfeld. This allowed early Vienna to start to develop towards the Middle Ages.