The Astonishing Stories Behind Some Of History’s Most Famous Vikings, From Erik The Red To Ivar The Boneless

Published November 16, 2025
Updated November 28, 2025

Cnut The Great, The Christian King Who United Three Kingdoms

Cnut The Great

Wikimedia CommonsCnut the Great was one of the most accomplished rulers of medieval Europe.

Cnut the Great was a highly accomplished Viking warrior who then became a Christian king and united three kingdoms under his crown.

Born around 990, Cnut was King of England starting in 1016, King of Denmark starting in 1018, and King of Norway starting in 1028, with the three kingdoms united under his rule referred to together as the North Sea Empire. According to Historic UK, neither the place nor the date of his birth is known, though Cnut was the son of Sweyn Forkbeard — King of Denmark and the son of Harald Bluetooth — and a Polish princess.

As a youth, he accompanied his father on his invasion of England in 1013. Sweyn I Forkbeard was accepted as king of England by the end of 1013 but died in February 1014, after which the English king-in-exile Aethelred the Unready, returned. However, in the summer of 1015, Cnut’s fleet set sail for England with a Danish army of perhaps 10,000 in 200 longships.

Cnut then won the English throne in 1016 after prolonged fighting against Aethelred’s son, Edmund Ironside. Though they agreed to divide England between them, Edmund’s death in 1016 allowed Cnut to take over the whole of England.

Cnut Reproving His Courtiers

Wikimedia CommonsCnut the Great reproving his courtiers for their flattery.

To secure his power, Cnut married Emma of Normandy in 1017 in order prevent her brother, Duke Richard II, from supporting King Aethelred’s sons. He became king of Denmark upon the death of his brother, King Harold II of Denmark in 1018, and extended his realm to Norway in 1028.

Cnut died aged around 45 in Dorset, England, on November 12, 1035, and was buried in the Old Minster, Winchester. Though he had achieved great unity in life, his death put an end to the North Sea Empire, which fractured as his heirs fought for the throne.

author
Austin Harvey
author
A staff writer for All That's Interesting since 2022, Austin Harvey has also had work published with Discover Magazine, Giddy, and Lucid, covering topics including history, and sociology. He has published more than 1,000 pieces, largely covering modern history and archaeology. He is a co-host of the History Uncovered podcast as well as a co-host and founder of the Conspiracy Realists podcast. He holds a Bachelor's degree from Point Park University. He is based in Pittsburgh, Pennsylvania.
editor
Kaleena Fraga
editor
A senior staff writer for All That's Interesting since 2021 and co-host of the History Uncovered Podcast, Kaleena Fraga graduated with a dual degree in American History and French Language and Literature from Oberlin College. She previously ran the presidential history blog History First, and has had work published in The Washington Post, Gastro Obscura, and elsewhere. She has published more than 1,200 pieces on topics including history and archaeology. She is based in Brooklyn, New York.
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Harvey, Austin. "The Astonishing Stories Behind Some Of History’s Most Famous Vikings, From Erik The Red To Ivar The Boneless." AllThatsInteresting.com, November 16, 2025, https://allthatsinteresting.com/famous-vikings. Accessed November 30, 2025.