Several historical figures did write about technology far ahead of their time, and their actual, documented stories are worth telling accurately. One specific claim about Bartolomeu de Gusmão has the history essentially backward.
Several others treat medieval speculation as suppressed fact. What follows is what historians of science actually find in the primary sources.
Medieval Scholars, Real and Remarkable
Medieval church scholars really were, in substantial ways, custodians and systematizers of ancient knowledge, translating and preserving Greek and Arabic scientific and philosophical texts through monastery scriptoria across Europe, documented intellectual history well established by medieval historians. This preservation work laid groundwork for the later European Renaissance and scientific revolution. What deserves correction is the leap from this well-established historical fact to claims of hidden technology equivalent to smartphones and lasers, a leap the surviving texts don’t support.
Albertus Magnus, and the Legend Worth Presenting as a Legend
Albertus Magnus (c. 1200-1280) is a Dominican friar and Doctor of the Church, known as “Doctor Universalis,” a polymath who conducted empirical observation of nature well recorded in his surviving scientific writings on minerals, plants, and animals. The “Living Head,” or brazen head, story is also real in the sense that it’s a well-documented medieval legend, but it needs to be presented as exactly that, legend, rather than confirmed history. Medieval historians trace this tale to popular folklore that developed around Albertus’s reputation for scholarship, a recognizable pattern in which celebrated medieval intellectuals accumulated legendary abilities in popular storytelling well beyond their actual, verified work. No surviving primary source from Albertus’s own lifetime describes him building a functioning mechanical device, and the story’s ending, destruction by his student Thomas Aquinas, appears only in later retellings.
Roger Bacon Speculated. He Didn’t Report.
This needs an important distinction the original framing blurs. Roger Bacon (c. 1214-1292) is known as the “Doctor Mirabilis,” and his surviving writing, most notably his 1267 letter Epistola de Secretis Operibus Artis et Naturae, et de Nullitate Magiae, “Letter on the Secret Works of Art and Nature, and the Nullity of Magic,” did describe theoretical future machines, self-propelled ships, flying devices, that Bacon proposed should be possible to build using natural philosophy’s principles. Medieval historians of science are clear about what this represents: forward-looking theoretical speculation grounded in Bacon’s understanding of mechanics and optics, a celebrated intellectual achievement in its own right, not a description of devices he had witnessed, built, or accessed through forbidden channels. Presenting Bacon’s speculative genius as evidence of suppressed existing technology undersells what he actually accomplished: correctly reasoning toward future possibilities centuries before the engineering to realize them existed.
What Bacon’s Writing Describes
Bacon’s theoretical proposals for self-moving vehicles and vessels do exist in his surviving letter, presented explicitly as things he believed could be constructed based on mechanical principles, not devices already built. His established work on optics, magnifying lenses and burning mirrors that concentrate sunlight, is documented medieval science, precursors to telescopes and magnifying glasses, though the specific comparison to smartphones overstates what optical magnification and light concentration actually represent.
The Real History of Brazen Head Legends
Expanding on the broader medieval legend tradition the Albertus Magnus story belongs to is worth doing, since it’s considerably richer than a single isolated tale. Medieval folklore attributes talking brazen heads not only to Albertus Magnus, but separately and independently to Roger Bacon himself, and to other medieval scholars including the semi-legendary Pope Sylvester II, a historical 10th-century pope whose scholarly reputation for mathematics and astronomy similarly accumulated legendary embellishment over subsequent centuries. Folklorists studying this recurring pattern note that brazen head stories generally served a recognizable cultural function: dramatizing anxieties about knowledge that exceeded ordinary human capability, and about the moral dangers of pursuing wisdom too far beyond accepted bounds, a thematically consistent medieval literary motif rather than independent reports of an invented device. Recognizing this broader pattern helps explain why nearly identical stories attach themselves to multiple historical scholars independently, a hallmark of legend formation rather than historical reportage.
What Historians of Science Study
Naming the academic field that studies exactly this kind of question professionally is worth doing. The history of science, an established academic discipline with university departments, peer-reviewed journals, and scholars worldwide, specifically examines how medieval and early modern thinkers understood and speculated about the natural world, including serious study of figures like Bacon, Albertus Magnus, and Kircher. Historians of science including medievalist Lynn Thorndike, whose multi-volume work A History of Magic and Experimental Science remains a foundational academic reference, have spent careers carefully separating genuine medieval scientific achievement from later legendary embellishment, precisely the kind of careful, source-based work behind the corrections here. This academic field offers considerably richer, more rigorously sourced material for anyone curious about medieval intellectual history than secondhand retellings built on unverified claims.
Leonardo’s Riddles, Correctly Understood
Leonardo da Vinci (1452-1519) wrote passages resembling prophecy in his notebooks, but this needs accurate context: Leonardo composed these as a deliberate literary genre he practiced, riddles describing everyday phenomena in deliberately mysterious, portentous language as an intellectual game, scholars of his notebooks have described this practice extensively. His notebook riddle describing distant communication most likely referred to existing technology of his own era, postal letters and messengers, phrased riddle-style, rather than a literal prediction of the telephone. His engineering sketches for war machines, flying devices, and mechanical figures are documented evidence of extraordinary theoretical engineering talent, extensively studied by historians of technology, achievements remarkable enough without requiring access to forbidden knowledge to explain them.
Real Manuscripts, Real Scholars
Bartholomew of England’s 13th-century encyclopedia On the Properties of Things is documented medieval scholarship, a comprehensive compilation of natural philosophy knowledge available at the time, extensively studied by medievalists. Athanasius Kircher’s 1665 Mundus Subterraneus is a real published work, and Kircher’s geological speculation, while containing insights alongside errors typical of 17th-century natural philosophy, represents serious scholarly engagement with earth science questions, worth studying on its own terms as a record of its era’s scientific thinking rather than evidence of concealed advanced knowledge.
St. Giuseppe of Copertino | Church Tradition, Reported Faithfully
Giuseppe of Copertino is a canonized Catholic saint, and the historical record does include numerous contemporary witness accounts describing episodes interpreted as levitation during religious ecstasy, recorded in Church canonization records from his own era. This is worth reporting accurately as recorded religious testimony and Church tradition, a matter appropriately left to faith and continued theological reflection rather than resolved by this piece in either direction.
Bartolomeu de Gusmão
This needs the most substantial correction in this piece, because the history is essentially the reverse of what was originally claimed. Bartolomeu de Gusmão (1685-1724) is a Brazilian-born priest who, on August 8, 1709, demonstrated a model aircraft called the Passarola before King John V of Portugal at the Casa da Índia in Lisbon. This device was a hot-air balloon design, a small paper envelope heated by an open flame that rose several meters before descending as the flame’s heat dissipated, aviation history extensively recorded in archival records, including a Vatican Archive copy of his original petition. This was not a cover story replacing a magnet-powered device. The hot-air balloon is the actual, established history, occurring 74 years before the Montgolfier brothers’ more famous 1783 balloon flight in France.
Historians studying Gusmão’s legacy have identified the opposite pattern from the more dramatic version that circulates online: a later, fraudulent 1784 drawing depicting Gusmão actually flying aboard his machine, complete with a false 1774 publication date, was created and later exposed by historians as fabricated, an attempt to make Gusmão’s actual achievement appear even more dramatic than the historical record supports. Historical sources also indicate the claim that the Portuguese Inquisition specifically persecuted and suppressed Gusmão’s work is itself considered likely later invention by historians studying the primary record, rather than a verified historical event.
The 1751 Channel Crossing
No aviation history source could verify any 1751 English Channel crossing by a monk named Andrea Grimaldi in a mercury-powered flying device. The first confirmed aerial crossing of the English Channel occurred in 1785, aboard a hydrogen balloon piloted by Jean-Pierre Blanchard and John Jeffries, well established in aviation history. This specific 1751 claim should be treated as unverified.
Jonathan Swift’s Remarkable Coincidence
This is one of literature’s most celebrated coincidences, worth explaining with its scientific context. Swift’s 1726 Gulliver’s Travels does describe Martian astronomers having discovered two moons, decades before Asaph Hall’s 1877 discovery of Phobos and Deimos. Historians of science have identified a credible likely explanation that doesn’t require forbidden Church knowledge: Johannes Kepler, in his own published early 17th-century writing, had speculated Mars should have two moons based on a numerical progression he proposed running from Earth’s one moon to Jupiter’s four then-known moons. Swift, well-read in contemporary astronomical speculation, most likely drew on this published Keplerian idea already circulating among educated readers of his era. This established scientific and literary history makes Swift’s passage a remarkable case of informed speculation later validated by observation, arguably a more interesting story than access to secret archives.
No established history of astronomy source could verify the specific claim about a 17th-century Georgian scholar named Saba Orbeliani producing precise orbital calculations for Mars, and it should be treated as unverified.
The Technical Story Behind Gusmão’s Achievement
Adding the technical detail behind why Gusmão’s achievement mattered scientifically is worth doing, since it deserves fuller appreciation on its own terms. Historians note Gusmão reportedly arrived at his key insight after watching an ordinary soap bubble rise above a candle flame, correctly reasoning that heated air, being less dense than surrounding cooler air, could lift an object skyward, a sound physical principle he then tested experimentally across three public demonstrations in August 1709, the first ending in an accidental fire, the second and third achieving brief and small-scale ascents witnessed by royal court members, including Cardinal Michelangelo Conti, who would later become Pope Innocent XIII. This methodical, evidence-based experimental process, hypothesis drawn from ordinary observation, tested through repeated public demonstration, refined after failure, represents exactly the kind of scientific method medieval and early modern scholars were actively developing, worth appreciating as intellectual history in its own right rather than requiring an invented magnet-powered alternative to feel significant.
The Story Is Remarkable Enough
The documented history covered here needs no invented suppression to be worth telling. Albertus Magnus’s empirical curiosity, Roger Bacon’s theoretical brilliance correctly reasoning toward technologies centuries before their invention, Leonardo’s engineering genius, Kircher’s serious scientific inquiry, and Gusmão’s pioneering aviation achievement, seventy-four years ahead of the Montgolfiers, are substantial, and celebrated by historians precisely because they’re true. The Church archives hold extraordinary intellectual history. It just isn’t the more sensational version that circulates online, and the documented, footnoted version has the considerable advantage of actually being verifiable by anyone willing to check the primary sources these historians have spent careers carefully preserving and translating.
