Notre Dame is held together by a first-of-its-kind ‘iron skeleton,’ catastrophic fire revealed

Published

2 years ago

March 17, 2023

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In 2019, a fire broke out inside Notre Dame Cathedral in Paris, severely damaging the iconic medieval building. However, the catastrophic fire gave researchers an opportunity to study the building’s architecture like never before.

A few months after the inferno was extinguished, researchers discovered that the stones used to build the Gothic-style cathedral were held together using iron staples, a technique that had never been documented before in a building from this time period, according to a study published March 15 in the journal PLOS One (opens in new tab) .

Notre Dame was constructed in multiple phases starting in the early 12th century and continuing for the next 300 years, according to the Notre Dame Cathedral website (opens in new tab) .

“This is the first building of its kind in which we see this,” lead author Maxime L’Héritier (opens in new tab) , a professor in the Department of History at Paris 8 University, told Live Science. “This shows [that the builders] at the time were trying to experiment with new forms of construction.”

L’Héritier and his team analyzed 12 of the iron staples, which measure approximately 20 inches (50 centimeters) long and were part of the “iron skeleton” holding the building together, L’Héritier wrote in an essay for the archaeology publication Sapiens (opens in new tab) .

The staples offered additional reinforcements to the cathedral’s stonework, including holding together the large arches in the nave of the building’s towering 226-foot-tall (69 meters) twin towers. Without the staples’ support, this architectural feat would likely have been impossible to accomplish in 1160, when construction of the building began, according to the study.

“When we studied other Gothic churches of that time period, none used iron in their construction,” L’Héritier said. “We believe that the staples were what enabled them to build this structure at such a terrific height.”

Related: Notre Dame’s spire had 2 hidden coffins beneath it. Now, scientists know who was buried there.

Researchers radiocarbon dated the iron staples and discovered that they were used during one of the initial construction phases, “confirming that the production date of the staples was the same as the masonry, which also dated to around 1160,” L’Héritier said.

However, L’Héritier cautioned that it will take further analysis to know the iron’s exact origins.RELATED STORIES—14th-century sarcophagus found at fire-ravaged Notre Dame Cathedral

—Rebuilding Notre Dame will be incredibly hard

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“We’re trying to figure out if it’s local or more distant,” L’Héritier said. “There also seems to be different ore sources depending on whether the construction occurred in the 12th or 13th centuries. We do know that the [cathedral’s] bishop died at the end of the 12th century, so it’s possible that a new ore resource was used years later. We should know more in a year or two.”

In the four years following the blaze, Notre Dame has been undergoing reconstruction and is expected to reopen to visitors in December 2024, according to AP News (opens in new tab) .

World

Trump could meet Putin as early as next week to discuss Ukraine ceasefire – White House official

Published

28 mins ago

August 7, 2025

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Trump could meet Putin as early as next week to discuss Ukraine ceasefire - White House official

Donald Trump could meet Vladimir Putin in person as early as next week to discuss a ceasefire in Ukraine, a White House official has said.

They said the meeting would be conditional on the Russian president meeting his Ukrainian counterpart Volodymyr Zelenskyy, Sky News’s US partner network NBC News reported.

It came days before the White House’s deadline for Russia to reach a peace deal with Ukraine or face severe economic penalties, which could also target countries buying its oil.

Ukraine war latest

Asked during a news conference at the White House if the talks would take place, Mr Trump said: “There’s a very good prospect that they will.”

He said it had not been determined where the talks would take place, but added: “We had some very good talks with President Putin today.”

However, he said: “I’ve been disappointed before with this one.”

Asked if Mr Putin made any kind of concession to lead to the development, Mr Trump did not give much away, but added: “We’ve been working on this a long time. There are thousands of young people dying, mostly soldiers, but also, you know, missiles being hit into Kyiv and other places.”

Trump might finally be a step closer to ending the war

Seven hours is a long time in US politics.

At 10am, Donald Trump accused Russia of posing a threat to America’s national security.

At 5pm, Trump said there was a “good prospect” of him meeting Vladimir Putin “soon”.

There had, he claimed, been “great progress” in talks between his special envoy Steve Witkoff and the Russian president.

It’s difficult to gauge the chances of a meeting between the two leaders without knowing what “great progress” means.

Is Russia “inclined” towards agreeing a ceasefire, as Ukraine’s president now claims?

Is Putin prepared to meet with his Ukrainian foe Volodymyr Zelenskyy, too?

The very fact that we’re asking those questions suggests something shifted on a day when there was no expectation of breakthrough.

Trump repeatedly vowed to end the war within 24 hours of becoming president.

On day 198 of his presidency, he might, just might, be one step closer to achieving that.

More tariffs ‘could happen’

Mr Trump also said he could announce further tariffs on China similar to the 25% he announced on India over its purchases of Russian oil.

“Could happen,” he said, after saying he expected to announce more secondary sanctions intended to pressure Russia into ending its war with Ukraine.

Earlier, he imposed an additional 25% tariff on Indian goods, on top of a previous 25% tariff, over its continued purchases of Russian oil.

India’s foreign ministry spokesperson said the additional tariffs were “unfair, unjustified and unreasonable”.

It came after Mr Putin held talks with Mr Trump‘s special envoy Steve Witkoff in Moscow, with the meeting lasting around three hours.

In a post on Truth Social, Mr Trump said Mr Witkoff “had a highly productive meeting” with Mr Putin in which “great progress was made”.

He said he had updated America’s European allies, and they will work towards an end to the Russia-Ukraine war “in the days and weeks to come”.

‘The war must end’

Mr Zelenskyy later said he and Mr Trump spoke on the phone after the meeting. He said “European leaders also participated in the conversation” and “we discussed what was said in Moscow”.

He added: “Our common position with our partners is absolutely clear: The war must end. We all need lasting and reliable peace. Russia must end the war that it started.”

Mr Zelenskyy later said: “It seems that Russia is now more inclined to agree to a ceasefire.”

He added that the pressure on Moscow “is working”, without elaborating, and stressed it was important to make sure Russia does not “deceive us or the United States” when it comes to “the details” of a potential agreement.

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