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Sent back in time 600 years and tasked with building the world’s largest dome, how would most of us fare? Most of us, of course, are not trained architects or engineers, but then, neither was Filippo Brunelleschi. Known at the time as a goldsmith, Brunelleschi ended up winning the commission to build just such a colossal dome atop Florence’s Cattedrale di Santa Maria del Fiore, which itself had already been under construction for well over a century. The year was 1418, the dawn of the Italian Renaissance, but a break with medieval building styles had already been made, not least in the rejection of the kind of flying buttresses that had held up the stone ceilings of previous cathedrals. Brunelleschi had thus not just to build an unprecedentedly large dome, in accordance with a design drawn up 122 years earlier, but also to come up with the technology required to do so.

“He invented an ox-driven hoist that brought the tremendously heavy stones up to the level of construction,” architect David Wildman tells HowStuffWorks. Noticing that “marble for the project was being damaged as it was unloaded off of boats,” he also “invented an amphibious boat that could be used on land to transport the large pieces of marble to the cathedral.”

These and other new devices were employed in service of an ingenious structure using not just one dome but two, the smaller inner one reinforced with hoops of stone and chain. Built in brick — the formula for the concrete used in the Pantheon having been lost, like so much ancient Roman knowledge — the dome took sixteen years in total, which constituted the final stage of the Cattedrale di Santa Maria del Fiore’s generations-long construction.

Brunelleschi’s masterpiece, still the largest masonry dome in the world, has yet to quite yield all of its secrets: “There is still some mystery as to how all of the components of the dome connect with each other,” as Wildman puts it, thanks to Brunelleschi’s vigilance about concealing the nature of his techniques throughout the project. But you can see some of the current theories visualized (and, in a shamelessly fake Italian accent, hear them explained) in the National Geographic video [below]. However he did it, Brunelleschi ensured that every part of his structure fit together perfectly — and that it would hold up six centuries later, when we can look at it and see not just an impressive church, but the beginning of the Renaissance itself…

How Filippo Brunelleschi, untrained in architecture or engineering, built the world’s largest dome at the dawn of the Renaissance.

For more on the dome, see Ross King’s marvelous 2013 book, Brunelleschi’s Dome: How a Renaissance Genius Reinvented Architecture.

And for more on Brunelleschi— whose other accomplishments include the first precise system of linear perspective, which revolutionized painting and opened the way for the naturalistic styles of Renaissance art– see here.

* Filippo Brunelleschi

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As we go big, we might recall that it was on this date in 330 that Roman Emperor Constantine the Great consecrated Constantinople (on the site of what had been the ancient city of Byzantium; today, Istanbul). Constantine identified the site of Byzantium as a place where an emperor could sit, readily defended, with easy access to the Danube or the Euphrates frontiers, his court supplied from the rich gardens and sophisticated workshops of Roman Asia, his treasuries filled by the wealthiest provinces of the Empire.

The city became famous for its architectural masterpieces, such as Hagia Sophia, the cathedral of the Eastern Orthodox Church. Built by the eastern Roman emperor Justinian I as the Christian cathedral of Constantinople for the state church of the Roman Empire between 532 and 537, the church was then the world’s largest interior space and among the first to employ a fully pendentive dome. It is considered the epitome of Byzantine architecture and is said to have “changed the history of architecture”… It set the bar for Brunelleschi.

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