North Sea Empire

Lore & Background

The North Sea Empire was first united by Sweyn Forkbeard, king of Denmark since 986 and of Norway since 1000, when he conquered England in 1013. He died the following year, and his realm was divided. His son Cnut the Great acquired England in 1016 after defeating Edmund at the Battle of Assandun and striking an agreement that left Cnut ruling all of England north of the River Thames; Edmund died on 30 November 1016, leaving Cnut as sole king. Cnut cemented his power by marrying Æthelred's widow Emma in the summer of 1017. In 1018, he paid off his invasion fleet—with money contributed largely from the citizens of London—and was fully recognised as King of England. He claimed the Danish throne after his brother Harald died childless in 1018 or 1019, and went to Denmark in 1019 to claim the throne. Cnut subjugated Norway in 1028, sailing with 50 ships; a large contingent of Danish ships joined him, and King Olaf II withdrew into the Oslo Fjord while Cnut sailed along the coast, landing at various points and receiving oaths of allegiance from the local chieftains. Finally at Nidaros, now Trondheim, he was acclaimed king at the Eyrathing. At the height of his power (1028–1035), Cnut was the most powerful ruler in western Europe after the Holy Roman Emperor. He died in 1035 and his realm was again divided, but his successor in Denmark, Harthacnut, inherited England in 1040 and ruled it until his death in 1042.

Reader's Guide

The North Sea Empire represents a brief but significant consolidation of Norse power across the North Sea, demonstrating the reach of Viking-age thalassocracies. Its significance lies in Cnut the Great's ability to rule three distinct kingdoms simultaneously, making him a major European power. The empire's legacy is tied to its ephemeral nature: it fragmented after Cnut's death in 1035, though his son Harthacnut briefly reunited England and Denmark until 1042. The term 'North Sea Empire' was coined by historians at the beginning of the 20th century, though the conception of Cnut's domains as having constituted an empire can be found as early as 1623, in John Speed's Histoire of Great Britaine. The empire's dependence on the sea for connection and control highlights the maritime character of Norse political structures. Cnut's visit to Rome in 1027 was both personal—penance for ordering the murder of Ulf Jarl in Trinity Church on Christmas of 1026—and political—to assert himself as an equal to any other European monarch at the coronation of Conrad II as Holy Roman Emperor. The visit was fruitful: Cnut negotiated a reduction on tolls levied on Northern European pilgrims to Rome, and on the Papal tax on the pallium granted to English archbishops; he persuaded the Emperor to cede back to Denmark Schleswig and a strip of ancient Danish territory between Hedeby and the Eider; and the Emperor agreed to have his son Henry marry Cnut's daughter Gunnhild.

Did You Know?

• The term 'North Sea Empire' was coined by historians at the beginning of the 20th century, but the idea of Cnut's domains as an empire appears as early as 1623 in John Speed's Histoire of Great Britaine.
• Cnut paid off his invasion fleet in 1018 with money contributed largely from the citizens of London.
• Cnut ordered a housecarl to murder Ulf Jarl in Trinity Church (later Roskilde Cathedral) on Christmas of 1026.
• During his 1027 visit to Rome, Cnut negotiated a reduction on tolls for Northern European pilgrims and persuaded Emperor Conrad II to cede Schleswig back to Denmark.
• Cnut had coins minted with the inscription CNVT REX SW ('Cnut King of the Swedes'), though he may not have actually controlled Sweden for more than three years.