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Siege of Paris (845)

Siege of Paris (845) is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Siege of Paris (845) rather than just read about it. In short: The siege of Paris of 845 was the culmination of a Viking invasion of West Francia. The Viking forces were led by a Norse chieftain named "Reginherus", or Ragnar, who has been tentatively identified with the legendary saga character Ragnar Lodbrok.

Siege of Paris (845) — main illustration
Siege of Paris (845) — illustration

Key takeaways

  • Siege of Paris (845) belongs to science; place it in that map before memorising details.
  • Learn the definition first, then one example that makes the definition concrete.
  • Connect Siege of Paris (845) to a quantity you can measure, compute or draw — that is where exam questions come from.
  • Reproduce the core statement of Siege of Paris (845) from memory before moving on to harder problems.

Reference excerpt

The siege of Paris of 845 was the culmination of a Viking invasion of West Francia. The Viking forces were led by a Norse chieftain named "Reginherus", or Ragnar, who has been tentatively identified with the legendary saga character Ragnar Lodbrok. Reginherus's fleet of 120 Viking ships, carrying thousands of warriors, entered the Seine in March and sailed up the river. King Charles the Bald assembled a smaller army in response, but after the Vikings defeated one division, comprising half of the army, the remaining forces retreated. The Vikings reached Paris at the end of the month, during Easter. They plundered and occupied the city, withdrawing after Charles paid a ransom of 7,000 French livres [2,570 kg (2.53 long tons)] in gold and silver.

Background The Frankish Empire was first attacked by Viking raiders in 799 (ten years after the earliest-known Viking attack at Portland, Dorset, in England), which led Charlemagne to create a defence system along the northern coast in 810. The defence system repulsed a Viking attack at the mouth of the Seine in 820 (after Charlemagne's death) but failed to hold against renewed attacks of Danish Vikings in Frisia and Dorestad in 834. The attacks in 820 and 834 were unrelated and relatively minor; systematic raiding did not begin until the mid-830s, with the activity alternating between the two sides of the English Channel. Viking raids were often part of struggles among Scandinavian nobility for power and status. Like other nations adjacent to the Franks, the Danes were well informed about the political situation in France; in the 830s and early 840s they took advantage of the Frankish civil wars. Large raids took place in Antwerp and Noirmoutier in 836, in Rouen (on the Seine) in 841 and in Quentovic and Nantes in 842.

Invasion and siege In March 845 a fleet of 120 Viking ships containing more than 5,000 men entered the Seine under the command of a chieftain named "Reginherus", or Ragnar. Ragnar has been identified with the legendary saga figure Ragnar Lodbrok. Around 841, Reginherus was awarded land in Turholt, Flanders, by Charles the Bald, but he eventually lost the land as well as the favour of the king. Reginherus's Vikings raided Rouen on their way up the Seine in 845, and in response to the invasion, Charles – who was determined not to let the royal Abbey of Saint-Denis (near Paris) be destroyed – assembled an army which he divided into two parts, one for each side of the river. The Vikings attacked and defeated one of the divisions of the smaller Frankish army, took 111 of their men as prisoners and hanged them on an island on the Seine. This was done to honour the Norse god Odin, as well as to incite terror in the remaining Frankish forces.

The Vikings arrived in Paris on Easter Sunday, 29 March, entered the city and plundered it. During the siege, a plague broke out in their camp. The Norse – who had already been exposed to the Christian religion – first prayed to the Norse gods, then undertook a fast, acting on the advice of one of their Christian prisoners, and the plague subsided. The Franks could not assemble an effective defence, and the Vikings withdrew only after being paid a ransom of 7,000 livres (French pounds) of silver and gold by Charles, amounting to approximately 2,570 kg (2.53 long tons). Considering the Vikings' earlier loss of land to Charles, the substantial payment may also have been regarded as some form of compensation to the Viking leader and of the invasion itself being an act of revenge. This was the first of a total of 13 payments of so-called danegeld to Viking raiders by the Franks (the term is not expressly known to have been used at this point). While agreeing to withdraw from Paris, the Viking army pillaged several sites along the coast on the return voyage, including the Abbey of Saint Bertin. Although Charles had been criticised severely for granting the large ransom payment to the Vikings, he had other more critical issues to deal with at the same time, including disputes with his brothers, regional revolts, and disgruntled nobles as well as pressure from abroad. Since he had trouble trusting his own counts to assemble and lead troops to defeat the large Viking force militarily, paying them off instead bought Charles time and possibly peace from further Viking raids – at least in the near future. The synod of Paris was forced to convene at Meaux because of the siege, but it relocated to Paris after the siege was lifted.

… excerpt ends here. Continue reading the full article.

Illustrations

Siege of Paris (845) illustration
Siege of Paris (845): Map of Paris in the 9th century. The city was concentrated on Île de la Cité, an island in the Seine.
Map of Paris in the 9th century. The city was concentrated on Île de la Cité, an island in the Seine.

Worked examples

Example 1 — a first encounter with Siege of Paris (845)

Start with the simplest possible case. Write down what Siege of Paris (845) claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Siege of Paris (845) before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Siege of Paris (845) ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Siege of Paris (845)

In research
Siege of Paris (845) appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry
Engineering practice reuses Siege of Paris (845) in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom
Siege of Paris (845) is common in secondary-school and first-year university syllabi. It links to neighbouring topics 840s conflicts, 845, 9th century in West Francia, so understanding it makes those chapters shorter.
In everyday life
Look for Siege of Paris (845) outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.
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How to study Siege of Paris (845) in 20 minutes

  1. Read the reference excerpt below once, without taking notes.
  2. Close the page and write down what Siege of Paris (845) means in your own words.
  3. Compare your version with the excerpt and mark what you missed.
  4. Work through the three examples above with pen and paper.
  5. Explain Siege of Paris (845) out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Siege of Paris (845) in simple terms?

The siege of Paris of 845 was the culmination of a Viking invasion of West Francia. The Viking forces were led by a Norse chieftain named "Reginherus", or Ragnar, who has been tentatively identified with the legendary saga character Ragnar Lodbrok.

Why does Siege of Paris (845) matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Siege of Paris (845)?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Siege of Paris (845).

Tags

  • 840s conflicts
  • 845
  • 9th century in West Francia
  • Battles involving the Vikings
  • Military history of Île-de-France
  • Ragnar Lodbrok
  • River and lake piracy
  • Sieges involving Norway
  • Sieges involving the Carolingian Empire
  • Sieges of Paris
  • Sieges of the Middle Ages
  • Viking Age in France

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