The Rest Is History
The Rest Is History

King Arthur: The Mysteries of Merlin (Part 3)

October 18, 2026

AI Summary

5 min read

In the winter of 1139, an English chronicler named Henry of Huntingdon was traveling to Rome when he stopped at an abbey in Normandy. There, he was shown a recently completed manuscript called The History of the Kings of Britain by a writer named Geoffrey of Monmouth. Henry read it and declared himself stupefied. He was not alone. Within a decade, another chronicler, Alfred of Beverley, wrote that it was an embarrassment for any serious historian not to have read and engaged with this bombshell of a book. The book claimed to be a factual history, and it introduced two figures who had been barely known outside Wales: a king named Arthur and a wizard named Merlin. The only problem was that Geoffrey had made most of it up. This episode of The Rest Is History explores how Geoffrey of Monmouth’s literary fraud created the Arthurian mythos, and why so many intelligent medieval scholars believed him.

The Origin Story: Uther, Igrain, and the Wizard’s Spell

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What you'll learn

  • 1 (02:04) **The Conception of Arthur** - Uther Pendragon, besotted with Igrain, seeks Merlin’s help to enter the impregnable Tintagel.
  • 2 (08:13) **Geoffrey of Monmouth: The Inventor of the Arthurian Mythos** - The hosts discuss how Geoffrey’s “History of the Kings of Britain” (1130s) single-handedly launched the Arthur legend.
  • 3 (11:08) **A Literary Fraud and Its Endorsement** - The hosts compare Geoffrey’s work to Dan Brown’s “The Da Vinci Code,” noting how it was accepted as truth despite its inventions.
  • 4 (15:48) **The Real-World Consequences of Arthur’s Myth** - Arthur’s fictional conquests had tangible political impacts, from Edward I to the British Empire.
  • 5 (17:28) **The Rise of Merlin** - The hosts explain how Merlin, a minor character in Geoffrey’s history, became the central wizard of the legend.
  • 6 (22:54) **Merlin as a Historical Prophet** - Medieval scholars genuinely believed Merlin was a real historical figure, which gave his prophecies explosive power.
  • 7 (26:29) **The Cryptic Nature of Merlin’s Prophecies** - The hosts find modern equivalents for Merlin’s vague, Nostradamus-like predictions.

+ Full timestamped outline available in the app

Show Notes

What are the origins of Merlin, the powerful wizard and King Arthur’s advisor? Who was Geoffrey of Monmouth, and what role did he play in evolving the tales of Arthur and the Round Table? And, was Merlin based on a real historical figure from the Saxon invasion of Britain in the 5th century, and the totemic battle of Badon…?


Join Tom and Dominic as they delve into the true origins of history’s greatest wizard: Merlin….


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Video Editors: Jack Meek, Harry Swan + Adam Thornton 

Social Producer: Harry Balden

Producers: Tabby Syrett & Aaliyah Akude 

Senior Producer: Callum Hill  

Executive Producer: Dom Johnson

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