— Ch. 1 · The Great Heathen Army Invasion —
Danelaw.
~5 min read · Ch. 1 of 6
In 865, a massive Danish force landed in East Anglia with intentions far beyond simple raiding. This army, known as the Great Heathen Army, was not merely seeking gold to take back home. They intended to conquer and occupy four Anglo-Saxon kingdoms: Northumbria, Mercia, East Anglia, and Wessex. The leadership of this combined force included Halfdan Ragnarsson and Ivar the Boneless, sons of the legendary Viking leader Ragnar Lodbrok.
By 867, the Danes had captured Northumbria and its capital city, York, which they called Jórvík. They defeated both King Osberht and the usurper King Aella, placing an English puppet ruler named Ecgberht on the throne instead. The invasion continued southward into Mercia and East Anglia. In 869, Ivar the Boneless defeated King Edmund at Hoxne, conquering the entire Kingdom of East Anglia.
King Alfred of Wessex fought desperately against these invaders for years. He suffered heavy losses at Reading and Meretum but won a crucial victory at Ashdown on the 7th of January 871. Despite his success, King Alfred's brother and predecessor, King Aethelred, died shortly after that battle on the 23rd of April 871. Alfred then succeeded him as King of Wessex. For several years, Alfred paid tribute to the Danes just to buy peace while they ravaged other territories.
Treaties And Legal Boundaries
The legal framework of the Danelaw emerged from specific diplomatic agreements between King Alfred and Guthrum, the Danish warlord who led the army after Ivar's death. Following Guthrum's defeat at the Battle of Edington in 878, the Treaty of Wedmore established initial terms. Alfred demanded that Guthrum be baptized as a Christian, serving as his godfather during the ceremony.
Between 886 and 890, the Treaty of Alfred and Guthrum formalized the boundaries of their respective kingdoms. This agreement allowed the Danes to keep their own laws within their territory in exchange for loyalty to the English crown. The treaty created a zone where Danish law applied alongside Anglo-Saxon customs, establishing a unique legal duality across eastern and northern England.
Guthrum settled in East Anglia following these negotiations, though he later broke the peace by capturing Wareham and Exeter in 876 and 877. Alfred eventually forced a surrender again, leading to the final treaties that defined the region. These documents ensured peaceful relations between the two cultures for decades, allowing self-governance for the Danish settlers while maintaining nominal allegiance to Wessex.