Assassin's Creed Valhalla begins its English campaign in 873, when Eivor leaves Norway for England.
The game opens in Norway during the late ninth century, where Eivor is involved in the Raven Clan's struggle for a future. Eivor eventually leads the clan to England and establishes a settlement in the region of Mercia. The English setting includes conflicts involving several Anglo-Saxon kingdoms and Viking groups.
Valhalla uses historical figures and political events from the Viking Age, while also adding fictional characters and supernatural elements. The date is part of the game's chronology rather than a claim that every depicted event happened exactly as shown.
The year 793 is a common mix-up because it marks the Viking raid on Lindisfarne, an event often used as a symbolic beginning of the Viking Age. Valhalla's main English settlement story is set later, beginning in 873.