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Lyonesse

Lyonesse 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 Lyonesse rather than just read about it. In short: Lyonesse (pronounced /liːɒˈnɛs/ lee-uh-NESS) is a kingdom which, according to legend, consisted of a long strand of land stretching from Land's End at the southwestern tip of Cornwall, England, to what is now the Isles of Scilly in the Celtic Sea portion of the Atlantic Ocean. It was considered lost after being swallowed by the ocean in a single night.

Lyonesse — main illustration
Lyonesse — illustration

Key takeaways

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

Reference excerpt

Lyonesse (pronounced /liːɒˈnɛs/ lee-uh-NESS) is a kingdom which, according to legend, consisted of a long strand of land stretching from Land's End at the southwestern tip of Cornwall, England, to what is now the Isles of Scilly in the Celtic Sea portion of the Atlantic Ocean. It was considered lost after being swallowed by the ocean in a single night. The people of Lyonesse were said to live in fair towns, with over 140 churches, and work in fertile, low-lying plains. Lyonesse's most significant attraction was a castle-like cathedral. It is sometimes spelled Lionesse. Lyonesse is mentioned in Arthurian legend, specifically in the tragic love-and-loss story of Tristan and Iseult. It was the home of the hero Tristan (one of the Knights of the Round Table), whose father Meliodas was king of Lyonesse. After the death of Meliodas, Tristan became the heir of Lyonesse, but he was never to take up his inheritance because the land sank beneath the sea while he was away at his uncle King Mark's court in Cornwall. In later traditions, Lyonesse is said to have sunk beneath the waves in a single night, but stories differ as to whether this catastrophic event occurred on 11 November 1099, or 10 years earlier. According to one legend, the people of Lyonesse had committed a crime so terrible that God took his revenge against them and their kingdom. The exact nature of the crime is never specified, but the legend tells of a horrific storm that occurred over the course of a single night, resulting in an enormous wave that swallowed the kingdom.

The sole survivor

Local Cornwall village tourism guides offer stories of a man who escaped the storm and a subsequent wave while riding a white horse. Apparently, the horse lost one of its shoes during the escape. The rider's name is thought to be Trevelyan (or Trevilian). The rider had been out hunting during the day and had fallen asleep under a tree. Trevelyan was awoken by a horrible noise and raced across the land to higher ground. This story is linked to local Cornish families who have used the image of three horseshoes as part of their armorial bearings for generations. One family in particular goes by the name Vyvyan, and is one of Cornwall's oldest families; they also have a crest of a white horse and claim to be descendants of the sole survivor, Trevelyan. The Vyvyan family claims that Trevelyan was the last governor of the lost kingdom before Lyonesse was swallowed by the ocean. Today, many myths and legends continue to arise about Lyonesse without physical evidence. Included among these legends are tales of local fishermen who claim that on calm days, one can still hear the bells of the many churches softly ringing in the seas off the west Cornish coast. Local fishermen also claim that they have caught glass, forks, and wood in their fishing nets.

The Lyonesse Project

A 2009–2013 joint study titled The Lyonesse Project: A Study of the Coastal and Marine Environment of the Isles of Scilly was commissioned by English Heritage and carried out by the Historic Environment Projects, Cornwall Council, with a team of academics, local experts, and enthusiasts "to reconstruct the evolution of the physical environment of the Isles of Scilly during the Holocene, the progressive occupation of this changing coastal landscape by early peoples, and their response to marine inundation and changing marine resource availability". The project found that much of the story of Lyonesse can be "dismissed as fantasy"; legends and memories of submergences are common throughout coastal northwestern Europe. However, the study did conclude that the Isles of Scilly were once a single large island, separated into smaller islands by the rapid rise of the sea. Stone walls have been found under the water in the vicinity of the Isles of Scilly, which support the findings that sea level rises affected the towns of the area, although whether they are evidence of buildings or the remains of medieval fish traps remains unclear.

Lyonesse in Arthurian legend In medieval Arthurian legend, no references are made to the sinking of Lyonesse, because the name originally referred to a still-existing place. Lyonesse is an English alteration of French Léoneis or Léonois (earlier Loönois). The French Prose Tristan appears to place Léonois beside Cornwall. In English adaptations of the French tales, Léonois, now "Lyonesse", becomes a kingdom closely associated with the Cornish region, though its exact geographical location remained unspecified. The name for the legendary lost land between Land's End and Scilly was based on the old Cornish name: Lethowsow. This derives from the Cornish name for the Seven Stones Reef, on the reputed site of the lost land's capital and the site of the notorious wreck of the Torrey Canyon. The name means 'the milky ones', from the constant white water surrounding the reef. Alfred, Lord Tennyson's Arthurian epic Idylls of the King describes Lyonesse as the site of the final battle between King Arthur and Mordred (King Arthur's nephew and illegitimate son). One passage in particular references legends of Lyonesse and its rise from (and subsequent return to) the ocean:

… excerpt ends here. Continue reading the full article.

Illustrations

Lyonesse: Isles of Scilly in 3 000 .mw-parser-output span.smallcaps{font-variant:small-caps}.mw-parser-output span.smallcaps-smaller{font-size:85%}BCE: With the lower sea level, most of the archipelago formed one large island with a central plain.
Isles of Scilly in 3 000 .mw-parser-output span.smallcaps{font-variant:small-caps}.mw-parser-output span.smallcaps-smaller{font-size:85%}BCE: With the lower sea level, most of the archipelago formed one large island with a central plain.

Worked examples

Example 1 — a first encounter with Lyonesse

Start with the simplest possible case. Write down what Lyonesse 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 Lyonesse 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 Lyonesse 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 Lyonesse

In research
Lyonesse 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 Lyonesse 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
Lyonesse is common in secondary-school and first-year university syllabi. It links to neighbouring topics Cornish folklore, Fictional European countries, Flood myths, so understanding it makes those chapters shorter.
In everyday life
Look for Lyonesse 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 Lyonesse in 20 minutes

  1. Read the reference excerpt below once, without taking notes.
  2. Close the page and write down what Lyonesse 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 Lyonesse out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Lyonesse in simple terms?

Lyonesse (pronounced /liːɒˈnɛs/ lee-uh-NESS) is a kingdom which, according to legend, consisted of a long strand of land stretching from Land's End at the southwestern tip of Cornwall, England, to what is now the Isles of Scilly in the Celtic Sea portion of the Atlantic Ocean. It was considered los…

Why does Lyonesse 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 Lyonesse?

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 Lyonesse.

Tags

  • Cornish folklore
  • Fictional European countries
  • Flood myths
  • History of the Isles of Scilly
  • Locations associated with Arthurian legend
  • Mythological populated places
  • Places in Celtic mythology

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