00:00Under the floor of a Tuscan chapel sits a sword embedded in solid rock.
00:04And x-rays confirm the iron is genuinely 800 years old.
00:08In the imperial treasury in Vienna rests a coronation blade
00:12containing trace elements that point to a single mountain in the Alps.
00:16In a museum in Burgos, a sword once dismissed as folklore
00:20turns out to be forged from steel
00:22that medieval Europe was not supposed to be able to make.
00:25These are not props. These are not legends.
00:28They are real blades, in real cases, in real museums.
00:33And every one of them carries a metallurgical signature
00:36that the textbooks of medieval Europe cannot fully account for.
00:41Today, six swords that should not exist for their era.
00:44Each one has been weighed, dated, scanned, and analyzed.
00:49Not one of them fits comfortably into the standard story
00:51of how medieval Europe forged its iron.
00:54And the textbooks, in most cases, were written before the measurements were taken.
00:59The first one is the strangest of them all,
01:01because there are around 170 of them,
01:04and almost no one has heard the name.
01:06We start in northern Europe in the 9th century.
01:09Picture the smoke of a Frankish forge somewhere along the Rhine,
01:12the orange glow of charcoal under hand-pumped bellows,
01:15a smith leaning over a billet of iron.
01:18By the standards of the era, this is high technology.
01:21By the standards of what was about to come out of that forge,
01:24it is barely a beginning.
01:26Around 170 blades survive,
01:28bearing a single inscription welded into the steel itself,
01:32Ulfberat.
01:33They were buried in graves from Ireland to the Volga,
01:36dropped in rivers, lost in bogs,
01:39recovered by archaeologists across two centuries.
01:41When materials scientist Dr. Alan Williams of the Wallace Collection in London
01:46examined a genuine Ulfberat under the microscope,
01:49the result was not just unusual.
01:52It was, by 9th century standards, impossible.
01:55The carbon content reached close to 1%,
01:57true crucible steel with almost no slag.
02:00To produce that steel,
02:02you needed a furnace capable of around 1,600 degrees Celsius,
02:05sustained for hours.
02:07European forges were not supposed to reach that temperature consistently
02:11for another eight centuries.
02:13The raw material itself appears to have come from the Indian subcontinent,
02:17Wootz steel,
02:18traded along the Volga route through the Islamic world into Frankish hands.
02:22Here is the part that lands hardest.
02:24The brand was so prized that medieval forgers tried to fake it.
02:28Counterfeit Ulfberats exist with the inscription misspelled,
02:32the steel ordinary bloomerie iron,
02:34the warrior who bought one almost certainly unaware that he was carrying a knockoff.
02:38A medieval consumer market for high-end steel with brand piracy in the 9th century.
02:44Nothing in our picture of that century is supposed to be ready for that.
02:47And the trade route that brought the raw material,
02:50Volga, Caspian, Persia, India,
02:53is documented in the archaeology,
02:55but absent from the standard textbook account of where Frankish iron came from.
02:59From a forge along the Rhine, we move to a glass case in the Louvre,
03:03where a sword that has been continuously rebuilt for over a thousand years
03:07still serves as the coronation blade of the kings of France.
03:12Joyeuse, the sword of Charlemagne.
03:14Or, more honestly,
03:16the sword that has been called Charlemagne's sword for so long
03:19that the name has fused to the object.
03:22It rests today in the Department of Decorative Arts of the Louvre,
03:25and from the coronation of Philip Augustus in 1180
03:28to the coronation of Charles X in 1825,
03:32it was placed into the hand of every French king at the moment they became king.
03:36The legend says the pommel contains a fragment of the lance of Longinus.
03:40The legend says the blade changed color 30 times a day.
03:44The reality, when modern conservators took the sword apart,
03:48is almost stranger than the legend.
03:50Joyeuse is not a single sword.
03:52It is a composite, assembled across centuries.
03:56The pommel dates to roughly the 10th or 11th century.
03:59The crossguard is 12th century work.
04:02The grip was replaced in the 13th.
04:04The scabbard was redone in the 19th.
04:06Each French king, in effect,
04:08inherited a sword that had already been rebuilt by his predecessors.
04:12But the analysis revealed something the textbooks were not ready for.
04:16Components within the blade itself have been dated as early as the 9th century,
04:21overlapping, just barely, with Charlemagne's actual lifetime.
04:25Whether the original 9th century blade was his, no one can prove.
04:29What we can say is that a piece of iron from his century
04:32is still inside the object that crowns kings.
04:35800 years of monarchy,
04:37holding onto a fragment of metal forged when Aachen was still a capital.
04:40This artifact has been on display since the 19th century.
04:44Its standard caption has not been updated to reflect every measurement modern conservators have taken.
04:50If you find that ordinary documentaries tell this kind of story too flatly,
04:55the blade is from the 9th century,
04:56the hilt from the 13th, end of label.
04:59Subscribe.
05:00This channel goes where the textbooks stop.
05:02Now, to Castile,
05:04where a sword once dismissed as a fairy tale
05:07turned out to be forged from impossible steel.
05:10The Tizona of El Cid.
05:12Burgos, Spain.
05:14For decades, historians treated the sword in the Museum of Burgos
05:18the way you treat a fairy tale prop.
05:20Pleasant, pious,
05:22almost certainly not what it claimed to be.
05:24The legend said it had belonged to Rodrigo Diaz de Vivar,
05:27the 11th century Castilian warlord remembered as El Cid Campeador.
05:32The label said, maybe.
05:34The scholarship, for most of the 20th century,
05:37said almost certainly not.
05:39Then, in 1999,
05:40the metallurgist Alonso Victor de Cea
05:43conducted a detailed analysis of the blade.
05:45Carbon content,
05:47microstructure,
05:48slag distribution,
05:50forge welding pattern.
05:51The results were not ambiguous.
05:53The steel was consistent with 11th century Moorish forging techniques.
05:58Specifically associated with Cordoba.
06:00The structure was crucible steel adjacent,
06:03closer to what was being produced in the Islamic world
06:06than to anything coming out of Christian European forges of the same era.
06:10The hilt was 16th century work, added later.
06:13The blade was real and old,
06:15and made by a tradition,
06:17the textbooks of Castilian history tend to mention only in footnotes.
06:21Notice what the metallurgy is quietly telling us.
06:2411th century Iberian steel,
06:26made under Islamic technical influence,
06:29was good enough that a Castilian warlord
06:31who fought on both sides of the Christian-Muslim frontier
06:34wanted that steel in his hand.
06:36Not the steel of his own kingdom,
06:38the steel of his enemies,
06:40and sometimes,
06:41his employers.
06:42The tizona is a small piece of evidence
06:45for a transfer of metallurgical knowledge
06:47across the Pyrenees
06:48that mainstream histories often understate.
06:50The textbook explanation calls it a relic of doubtful authenticity.
06:55The microscope calls it a Cordoban masterpiece.
06:58Quick aside before we move on,
07:00drop your country in the comments.
07:02I am genuinely curious how far this story has traveled.
07:05Now, across the channel,
07:07to a sword whose tip was deliberately broken at the forge,
07:10800 years ago,
07:11to embody an idea.
07:13The crown jewels of England include a sword
07:15you have probably never heard of,
07:17even though it has been used in the coronation
07:19of every English monarch in living memory.
07:22It is called Cortana,
07:24the Sword of Mercy.
07:26The current blade is believed to incorporate elements
07:29from the 13th century,
07:30which already makes it the oldest item
07:32in continuous ceremonial use in the British monarchy.
07:36But, the strange thing about Cortana
07:38is not its age.
07:39It is its tip.
07:41The tip is broken,
07:42square-cut,
07:43blunt,
07:44deliberately so.
07:45Tradition links the sword to Tristan,
07:48to Augere,
07:49the Dane,
07:50to Edward the Confessor,
07:52names that wander between history and romance.
07:54The legend says,
07:56the tip was broken in single combat,
07:58when an angel intervened to prevent a killing blow.
08:00The reality,
08:01examined by the royal armories,
08:03is that the blunting appears intentional.
08:05A medieval sword,
08:07forged or modified to be incapable of killing.
08:10Think about what that requires,
08:11a culture that,
08:12in the 13th century,
08:14decided to manufacture a piece of state regalia,
08:17that was a sword in every visual respect,
08:19and not a sword in the only respect that mattered to a medieval warrior.
08:23The doctrine of royal mercy,
08:25made physical.
08:26There is no other surviving European sword,
08:28from the period that was deliberately produced,
08:31to be ceremonially incomplete in this way.
08:33And the question of whether the tip was broken at the forge,
08:36or cut later,
08:37on purpose,
08:38has never been fully resolved.
08:40Of the cases we have walked through so far,
08:43has any one of them changed your picture of the medieval mind?
08:46Hold that thought.
08:47The next case is going to test it harder.
08:50Vienna.
08:51The imperial treasury.
08:53In a hall surrounded by the regalia of the Holy Roman Empire,
08:57orbs,
08:57crowns,
08:58scepters,
08:59reliquaries,
08:59there is a sword named for a 3rd century Roman legionary saint,
09:04used to coronate emperors a thousand years after his death.
09:07The sword of St. Maurice.
09:09The version housed in Vienna,
09:11is the more historically significant of the two surviving claimants to that name.
09:15Its core blade has been dated to the 12th century.
09:18The grip and the gilded ornamentation,
09:20were added during the coronation of Otto IV in 1198,
09:24when the sword was placed in his hand,
09:26at the moment he became Holy Roman Emperor.
09:29Every emperor after Otto,
09:31for centuries,
09:31took up the same blade.
09:33Here is where the metallurgy gets specific.
09:35Trace element analysis of the iron points to a particular ore source in the eastern Alps,
09:41meaning the smith who forged it,
09:43was working from a local,
09:45identifiable supply,
09:46not generic medieval iron stock.
09:49The forge welding technique used to bind the core of the blade to its edges,
09:52is unusually sophisticated for a late 12th century Central European workshop.
09:58The marks on the steel are consistent with a high-status Germanic forge,
10:02operating at a level the standard accounts of 12th century European metallurgy,
10:06do not generally credit.
10:08A blade named for a Roman saint,
10:10forged by a German smith in the Alps,
10:13used to crown Holy Roman Emperors for hundreds of years.
10:16A thousand years of European history compressed into a single weapon.
10:20And the seventh, well, technically the sixth,
10:23and the one most archaeologists wish would go away.
10:26Stay with me.
10:27It is also the one with the cleanest evidence.
10:30Tuscany.
10:31A small round chapel on a hilltop near Siena,
10:35called the Rotonda di Montesiepi.
10:37Embedded in a block of stone in the floor of that chapel,
10:40with about 30 centimeters of blade still buried in the rock,
10:44sits a sword.
10:45The legend says it was driven into the stone in the year 1180
10:49by a young Tuscan knight named Galgano Guidotti,
10:53who had renounced violence and pushed his sword into the rock,
10:57as a cross to pray before.
10:58He died the following year,
11:00was canonized in 1185,
11:02and the chapel was built around the sword.
11:04For eight centuries, almost no one took the story seriously.
11:08The whole thing was assumed to be a medieval echo of the Arthurian legend,
11:11a local imitation, a pious fraud, a relic for pilgrims.
11:16Then in the early 2000s, Professor Luigi Garlascelli,
11:20a chemist at the University of Pavia,
11:22conducted a sustained investigation,
11:25radiocarbon dating on organic material adhering to the blade.
11:29Metallurgical analysis on the exposed iron.
11:32The results were consistent with a 12th century origin.
11:35The sword is real.
11:37The date is real.
11:38The iron is genuinely from the era of Galgano Guidotti.
11:42Then, ground-penetrating radar was run on the stone beneath the sword.
11:47The radar showed a cavity underneath,
11:49a chamber, possibly a burial chamber,
11:52directly below the embedded blade.
11:54Whatever is in that cavity has not been excavated.
11:57The chapel authorities have not granted permission.
12:00We are, in 2026,
12:02in the position of knowing that a real 12th century sword is real,
12:06that it really is embedded in real rock,
12:09that there is something hollow underneath it,
12:11and that no one has looked.
12:13The textbook explanation is that the stone was carved out around an existing sword,
12:17and then sealed.
12:18The radar signature does not entirely cooperate with that reading.
12:22The legend, after 800 years,
12:24has stopped being entirely a legend,
12:26and started being a measurement problem.
12:28Six swords,
12:29six museums,
12:30six small fractures in our assumptions about what medieval Europe could make,
12:35what it could trade,
12:36what it could preserve,
12:37and what it could believe.
12:39The Ulfbert steel came from India.
12:41The Tizona came from a Cordoban forge,
12:43whose technical lineage Christian Europe was not supposed to share.
12:47The Saint-Maurice came from a specific mountain in the eastern Alps.
12:51Joyeuse is a sword that has been continuously rebuilt around an ancient core for over a thousand years.
12:57Kirtana is a deliberate idea,
13:00sharpened into iron and then unsharpened on purpose.
13:03And the Monticepi sword is a piece of 12th century iron,
13:07sitting in a Tuscan rock,
13:08above an unexcavated chamber.
13:10What unites them is not lost knowledge.
13:13It is the way medieval Europe quietly received,
13:16transmitted,
13:17and preserved metallurgical and ceremonial knowledge
13:20that the standard textbook chapters tend to flatten or skip.
13:24Trade routes our maps barely show.
13:27Forged techniques crossing religious frontiers,
13:30our histories prefer to keep clean.
13:32Symbolic gestures,
13:34a broken tip,
13:35a sealed chapel
13:36that we still cannot fully decode.
13:39The artifacts are real.
13:41The methods in most cases are gone.
13:43The textbooks in most cases
13:45were written before the measurements were taken.
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