Cnut

• 1. Introduction

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  Cnut stood at the edge of the sea and commanded the tide to stop. Whether that story is read as the act of a tyrant who believed his own legend, or as a wise king making a point about the limits of earthly power, it tells you something essential about how this man has been remembered: at once larger than life and quietly misunderstood.

  He was born around 990, the son of a Danish prince. By the time he died on the 12th of November 1035, he had made himself King of England, Denmark, and Norway. Historians call the territory he assembled the North Sea Empire. Medieval historian Norman Cantor called him something more direct: "the most effective king in Anglo-Saxon history".

  How did a Danish prince raised on Viking raids become the ruler of three kingdoms? What kind of man was he, underneath the titles? And what happened to everything he built, the moment he was gone?

• 2. A Prince from the North

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  Swein Forkbeard, Cnut's father, was heir to Harald Bluetooth, the Danish king who oversaw the Christianization of Denmark and was one of the first Scandinavian rulers to accept Christianity. Cnut inherited a dynasty that had spent generations unifying Scandinavia and reaching into England.

  His mother remains a puzzle. The Chronicon of Thietmar of Merseburg and the Encomium Emmae both name her as Swietoslawa, a daughter of Mieszko I of Poland. Norse sagas of the High Middle Ages call her Gunhild, a daughter of Burislav, king of Vindland. Adam of Bremen offered a third account, identifying her as a former queen of Sweden, though most historians consider this an error.

  The Flateyjarbók, a 13th-century Icelandic source, says Cnut was taught his soldiery by the chieftain Thorkell the Tall, at the stronghold on the island of Wollin, off the coast of Pomerania. That training would prove decisive. A skald named Óttarr svarti noted that Cnut was "of no great age" when he first went to war, with the earliest possible campaign traceable to his father's attack on Norwich in 1003-04, following the St. Brice's Day massacre of Danes by the English in 1002.

  The Knýtlinga saga, written in Iceland in the 13th century, left a physical description: "Knut was exceptionally tall and strong, and the handsomest of men, all except for his nose, that was thin, high-set, and rather hooked. He had a fair complexion and a fine, thick head of hair. His eyes were better than those of other men, being both more handsome and keener-sighted."

• 3. Conquest of England

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  In the summer of 1015, Cnut's fleet set sail for England with a Danish army of perhaps 10,000 men in 200 longships. The invasion force was composed primarily of mercenaries, drawn from across Scandinavia.

  The Peterborough Chronicle records that in early September 1015, Cnut came into Sandwich and sailed around Kent to Wessex, harrying in Dorset, Wiltshire, and Somerset, beginning a campaign of an intensity not seen since the days of Alfred the Great. Queen Emma's Encomium described the fleet in vivid terms: lions of gold on the prows, bulls with horns shining with gold, and among the men, "no slave, no man freed from slavery, no low-born man, no man weakened by age".

  Practically all the battles that followed were fought against Edmund Ironside, the eldest son of the English king Æthelred. The two sides fought at Penselwood in Somerset, at Sherston in Wiltshire over two days without a decisive result, and at Brentford, where Edmund temporarily drove the Danes back. The turning point came on the 18th of October 1016, at the Battle of Assandun, fought in Essex. Eadric Streona, an English earl who had switched sides more than once, withdrew his forces mid-battle, bringing about a decisive English defeat.

  Afterward, on an island near Deerhurst, the two kings met. Cnut, who had recently wounded Edmund, agreed to terms: all of England north of the Thames would go to the Danes, all to the south would remain with Edmund, along with London. When Edmund died on the 30th of November 1016, the entire realm passed to Cnut by the terms of that agreement. He was crowned by Lyfing, Archbishop of Canterbury, in London in 1017.

• 4. King of England

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  Cnut moved swiftly to eliminate rivals. In July 1017 he wed Queen Emma, the widow of Æthelred and daughter of Richard I, Duke of Normandy, a marriage that neutralized the Norman connection to the old dynasty's heirs.

  In 1018 he collected a Danegeld of £72,000 levied nationwide, with an additional £10,500 extracted from London alone. With that, he paid off his army and sent most of them home, retaining only 40 ships and their crews as a standing force. He then rebuilt the administrative framework of England, grouping shires under large earls in four regional units: Wessex initially under his own control, Northumbria under Erik of Hlathir, East Anglia under Thorkell the Tall, and Mercia under the chronically treacherous Eadric Streona. Streona was executed within a year.

  By the 1030s, direct control of Wessex had passed to Godwin, an Englishman from a powerful Sussex family. Cnut had come to rely on Anglo-Saxon families who earned his trust, not only his Scandinavian followers. He reinstated the Laws of King Edgar, issued the law codes known as I Cnut and II Cnut (largely produced by Wulfstan II of York), and strengthened the currency by minting coins of equal weight to those used in Denmark and across Scandinavia.

  His 1019 letter to England, written from Denmark, sets out his governing philosophy plainly: he warned that any person, "ecclesiastic or layman, Dane or Englishman", who defied God's law and his royal authority must be brought to heel or driven from the land. The protection he lent against Viking raiders restored prosperity that had been eroding since the resumption of Viking attacks in the 980s.

• 5. The North Sea Empire

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  Harald II of Denmark died in 1018, and Cnut crossed to claim that crown, becoming king of both England and Denmark. He appointed Ulf Jarl, the husband of his sister Estrid Svendsdatter, as regent of Denmark, and sent his young son Harthacnut to be held there as the designated heir.

  When Olaf Haraldsson of Norway and Anund Jakob of Sweden exploited Cnut's focus on England and attacked Denmark, Ulf used the crisis to get the Danish freemen to accept the child Harthacnut as king, making himself the effective ruler. Cnut sailed to Denmark to deal with Ulf. The two kingdoms fought at the mouth of the river Helgeå, probably in 1026, and Cnut came away dominant. Ulf's realignment did not save him: sources say the two brothers-in-law were playing chess at a banquet in Roskilde when an argument broke out, and on Christmas 1026, one of Cnut's housecarls killed Ulf with the king's blessing, in Trinity Church, the predecessor to Roskilde Cathedral.

  In 1028, Cnut set off from England to Norway with a fleet of fifty ships. King Olaf Haraldsson could not mount a serious resistance, both because Cnut had bribed his nobles and, according to Adam of Bremen, because Olaf had been in the habit of arresting their wives on charges of sorcery. Cnut was crowned in Trondheim and now held the throne of Norway as well. He entrusted the earldom to Håkon Eiriksson, whose family had long opposed the independent Norwegian kings.

  In 1031, Cnut marched into Scotland with an army and a navy in the Irish Sea, and received without bloodshed the submission of three Scottish kings: Maelcolm, the future king Maelbeth, and Iehmarc. His reach also extended into Ireland, where coinage struck in Dublin by Sigtrygg Silkbeard bore Cnut's quatrefoil design around 1017, and where Cnut's court poet Sigvatr Þórðarson wrote that famous princes brought their heads to Cnut and bought peace.

• 6. Rome and the Christian King

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  In Easter 1027, Cnut travelled to Rome to witness the coronation of the Holy Roman Emperor Conrad II. He walked in the imperial procession alongside the King of Burgundy, standing shoulder-to-shoulder with the Emperor on the same pedestal. Conrad gave Cnut lands in the Mark of Schleswig, the land-bridge between the Scandinavian kingdoms and the continent, as a token of their friendship.

  Cnut wrote to his English subjects from Rome explaining what he had accomplished there: he had negotiated a reduction in the fees English archbishops paid for the pallium, and secured an edict, witnessed by four archbishops, twenty bishops, and what he described as "innumerable multitudes of dukes and nobles", guaranteeing safe and toll-free passage for English merchants and pilgrims on the road to Rome. The "Robert" he names as co-guarantor is thought by scholars to be a scribal error for Rudolph, the last independent ruler of the Kingdom of Burgundy.

  His relationship with the Church was complicated. He had been baptized Christian under the name Lambert, but he maintained two wives simultaneously: Emma of Normandy, his queen, and Ælfgifu of Northampton, whom he kept in the south with an estate in Exeter. He was happy to let his skalds praise him in the imagery of Norse mythology, invoking the god Freyr, even as he positioned himself as a Christian ruler. To reconcile these tensions, he repaired English churches and monasteries damaged in Viking raids and refilled their coffers. He gave Winchester's New Minster a cross bearing 500 marks of silver and 30 marks of gold. He sent a psalter and sacramentary made in Peterborough to Cologne, and a book written in gold to William the Great of Aquitaine.

  The Bishop of Chartres, on receiving one of Cnut's gifts, wrote back in some amazement: "When we saw the gift that you sent us, we were amazed at your knowledge as well as your faith... since you, whom we had heard to be a pagan prince, we now know to be not only a Christian, but also a most generous donor to God's churches and servants."

• 7. What He Left Behind

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  Cnut died on the 12th of November 1035 in Shaftesbury, Dorset, and what followed showed how much his empire depended on the man himself. In Denmark, his son Harthacnut was meant to succeed, but he was occupied with war against Magnus I of Norway and stayed away from England too long. His mother Queen Emma was forced to flee Winchester for Bruges. Harold Harefoot, Cnut's son by Ælfgifu of Northampton, became regent and then king until his own death in 1040. Harthacnut finally claimed both thrones and reunited England and Denmark, but he too died in 1042.

  Cnut's only known daughter, Gunhilda, married Conrad II's son Henry III eight months after Cnut's death, but she died in Italy before she could become empress consort. That marriage, had it lasted, might have bound the North Sea Empire to the Holy Roman Empire through blood ties. It did not last.

  Cnut was buried in the Old Minster at Winchester. After 1066, Norman builders raised Winchester Cathedral on the old Anglo-Saxon site and placed the previous burials, including Cnut's, in mortuary chests. During the English Civil War, Roundhead soldiers scattered the bones on the floor. They were collected again after the restoration of the monarchy and replaced in the chests, though in somewhat uncertain order.

  The eight skalds who composed at Cnut's court left some of the most vivid testimony of what his contemporaries thought of him. Sigvatr Þórðarson praised him as being "dear to the Emperor, close to Peter". The refrain of Þórarinn loftunga's Höfuðlausn translates: "Cnut protects the land as the guardian of Byzantium God does Heaven." Those lines were composed while the king was still alive, and they were meant to be heard by a court that included both Englishmen and Scandinavians, which was itself the clearest evidence of what Cnut had built.

• 8. The Story of the Tide

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  Henry of Huntingdon recorded the tide story in his Historia Anglorum in the early 12th century, and it is by far the best-known episode in Cnut's legacy. In Henry's account, Cnut ordered his chair placed on the seashore as the tide was coming in and commanded the rising water not to wet the clothing or limbs of its master. The sea came up as usual and drenched his feet and shins. Cnut then declared: "Let all the world know that the power of kings is empty and worthless, and there is no king worthy of the name save Him by whose will heaven, earth and the sea obey eternal laws."

  In modern readings, the story is almost always told as a demonstration of humility. Cnut performs the command knowing it will fail, to teach his court that no earthly king holds power over nature or God. The version that casts him as a genuine tyrant who believed he could stop the sea has largely faded.

  What is striking is how well the story fits the man documented elsewhere. Cnut wrote letters to his subjects explaining his actions, negotiated toll reductions for pilgrims on the road to Rome, and walked the imperial procession at Conrad's coronation before sailing back north to secure Denmark. He seems to have understood, very precisely, what power could and could not do. The tide story, whatever its origin, describes a king who wanted that lesson known.