Cosme Ruggieri holds a unique place in French history. An Italian astrologer at the Valois court, he was one of the close advisors to Catherine de Médicis, to the point of influencing some major political decisions. Between astrological consultations, royal predictions, and matters of enchantment, his journey blends documented events and traditional tales. Portrait.
1. A Florentine in the Shadow of Kings
In the hushed corridors of the court of the last Valois, an enigmatic figure arouses fear and fascination. Cosme Ruggieri, an Italian astrologer from Florence, became one of the most intimate advisors to the powerful queen mother Catherine de Médicis. Son of a renowned physician-astrologer nicknamed Ruggieri the Elder, who is said to have served Catherine’s father at the beginning of the 16th century, young Cosme benefited early on from this prestigious connection. Tradition even holds that Catherine de Médicis, long childless, received an encouraging prophecy from the Florentine: he supposedly predicted she would become Queen of France and bear ten children, while she believed herself sterile. Indeed, Catherine ascended the throne alongside Henri II and bore a large offspring, reinforcing the almost mystical trust she placed in Ruggieri.
2. The Quiet Rise of an Astrologer at the French Court
Arriving in France without much fortune around 1571, Cosme Ruggieri sought to make a place for himself at the Valois court (a dynasty that ruled France from 1328 to 1589, notably with kings François II, Charles IX, and Henri III). He first attached himself to the retinue of the Tuscan ambassador Petrucci, then his solid education and intelligence drew attention. The grand equerry Henri de Montmorin hired him as Italian tutor to the young pages of Queen Élisabeth of Austria (wife of King Charles IX). This modest teaching position became the springboard for a discreet rise: Ruggieri soon attracted the attention of Catherine de Médicis herself, whose passion for astrology was well known.
Catherine de Médicis
A diplomatic report from 1574 notes that Ruggieri, who “professed to be well versed in judicial astrology” (predictive), had gained such credit with the Queen Mother that he “constantly had Her Majesty’s ear.” Catherine did not hesitate to consult him on matters of state: a dispatch dated September 2, 1572, for example, reports that she publicly asked her astrologer what stance to take regarding the Protestant princes held prisoner after the St. Bartholomew’s Day Massacre. Thanks to Catherine’s favor, the Florentine was no longer a mere court scholar – he became a true shadow advisor, blending divinatory arts and political intrigue.
3. The Médicis Column and Astrological Vigils
To facilitate his occult work, Catherine de Médicis provided Ruggieri with notable resources. In 1575, she had a mysterious hollow column erected in Paris near her new palace, 28 meters high with a spiral staircase – the Médicis column. It led directly to a secret observatory at the top, adjoining the queen’s private apartments.
Médicis Column. Source
This astonishing monument, still visible today (attached to the Bourse du Commerce in the Les Halles district), was intended for Ruggieri’s astrological vigils: Catherine, it is said, would join him there to study the Paris sky through instruments and horoscopes before each important decision. A close friend of the queen (some claim she had known him since childhood), Cosme Ruggieri advised her in the shadows, drawing from his knowledge of the stars a considerable influence over the kingdom’s affairs.
Plan of the Médicis Column. Source
4. The La Môle Affair: Wax Figurines and Political Witchcraft
However, the high favor enjoyed by the astrologer came with the dangers of court intrigues. His closeness to Prince François d’Alençon, Catherine’s younger son and leader of the “Malcontents” faction, dragged Ruggieri into a dark political witchcraft affair. Early in 1574, King Charles IX was dying and plots stirred the court. A nobleman, Joseph de La Môle, was accused of attempting to harm the king by occult means, with the complicity of Annibal de Coconas and other conspirators linked to the Duke of Alençon. The investigation soon revealed in La Môle’s chests a strange wax figurine pierced with needles – an effigy of King Charles IX, intended to strike him by enchantment. This malevolent figurine was the work of Cosme Ruggieri, seriously implicating the astrologer in the plot. Warned in time, Ruggieri fled on April 22, 1574, and took refuge with Ambassador Alamanni at the gates of Paris, but was handed over and barely escaped. A few days later, soldiers captured a peasant in the Saint-Germain-en-Laye forest whom they recognized as the disguised fugitive astrologer. Ruggieri was arrested and mercilessly sentenced to the galleys (forced rowing on royal galleys), while La Môle and Coconas were tortured, beheaded, and their heads displayed at Place de Grève on April 30, 1574.
However, against all odds, Cosme Ruggieri’s sentence was never carried out. Sent to Marseille to begin his punishment, he reportedly never actually touched an oar: thanks to mysterious support, he was soon found free to move about. Even better, an official pardon was granted shortly after. In 1585, he was rewarded with the commendatory abbacy (financial management) of the Abbey of Saint-Mathieu in Brittany, from which he comfortably drew income while holding the title of abbot until his death. It is ironic to think that a man versed in occult arts could become a commendatory abbot – but such favors were not uncommon for valuable servants of the Crown. If Ruggieri benefited from such clemency, it was most likely due to Catherine de Médicis’s intervention: it is whispered that the queen mother, informed of the affair’s secrets, wanted to save her confidant. Some contemporaries even claim that Ruggieri served as a spy for Catherine, reporting on the rebellious Alençon’s moves, which would explain why she protected him despite his proven guilt. In any case, after 1574 Cosme Ruggieri regained favor with power, while remaining a controversial figure.
5. Lingering Suspicions under Henri IV
Ruggieri’s fate then followed the upheavals of French history. Catherine de Médicis died in 1589, after seeing three of her sons reign successively. Henri III, the last Valois, was assassinated the same year, and the Protestant King Henri of Navarre became Henri IV, the first Bourbon. In this new context, the Italian astrologer, now in his sixties, continued to practice his art on the court’s margins. But his reputation caught up with him in 1598, when a new accusation of enchantment arose: in Nantes, Ruggieri was caught in possession of a wax figurine pierced in its heart, said to represent King Henri IV. To the authorities, this was a black magic plot against the sovereign’s life – a crime of lèse-majesté if ever there was one. Brought before the king’s justice, Ruggieri fiercely defended himself. He claimed that, on the contrary, he had once helped save Henri of Navarre by pleading his case to Catherine during the 1572 massacre.
St. Bartholomew’s Day Massacre. Source
To better understand, let us clarify this St. Bartholomew’s Day Massacre, one of the most tragic episodes of the French Wars of Religion, on the night of August 23-24, 1572. This massacre targeted French Protestants, called Huguenots, who had gathered in Paris to attend the wedding of the Protestant King Henri of Navarre (future Henri IV) with Marguerite de Valois, sister of King Charles IX. This marriage aimed to reconcile the two religious camps, but tensions were extreme. Under the influence of Catherine de Médicis and “certain royal advisors,” King Charles IX ordered the assassination of several Protestant leaders, starting with Admiral Gaspard de Coligny, a major Huguenot figure. The operation quickly degenerated into a widespread massacre: Parisian militias unleashed violence against all Protestants present in the city. It is estimated that several thousand people were killed in Paris, and up to 20,000 across the kingdom in the following weeks.
This statement refers to a secret episode: it is believed that the astrologer, present beside the queen during the St. Bartholomew’s Day Massacre, advised sparing the young Protestant prince Henri of Navarre (perhaps discerning a royal destiny for him). Notably, Henri IV himself seems to support this version: informed of the affair, the king confirmed that Ruggieri had been favorable to him in the past and ordered the old man’s immediate release. Thanks to royal indulgence, Cosme Ruggieri thus escaped the consequences of his occult practices a second time.
Ruggieri’s last years took place under the regency of Marie de Médicis, widow of Henri IV, between 1610 and 1614. The astrologer, dean of the court mages, remained active and sought after. He frequented the circle of the regent’s Italian favorites, Marshal Concino Concini and his wife Léonora Dori (called Galigaï), who appreciated this “fine mind” and his mysterious knowledge. Ruggieri even published astrological almanacs under a pen name (he signed his annual forecasts as Jean Querberus), to spread his starry predictions more widely. In the twilight of his life, the man some called the “queen’s sorcerer” enjoyed remarkable longevity at the French court: he served Catherine de Médicis, knew three Valois kings, witnessed the Bourbons’ rise, and now advised the new Médicis, Marie, thus perpetuating Florentine influence in the kingdom’s occult affairs.
6. A Theatrical Death and a Public Scandal
It was finally in March 1615 that Cosme Ruggieri took his leave, under dramatic circumstances worthy of his legend. Sensing his end near, the astrologer fell gravely ill in Paris. On March 28, 1615, on his deathbed, he received the priests who came to give him last rites with icy contempt. Ruggieri refused the Church’s final sacraments and brusquely dismissed the priest and monks who had come to his bedside. According to the gazette Le Mercure françois, his last words to the stunned clergy were: “You fools, all of you out! There are no other devils than the enemies who torment us in this world, nor any other god than kings and princes who can grant us honors and riches.” This sacrilegious outburst, shouted at death’s door, scandalized the public. Barely had Ruggieri expired when rumors of his impiety set Paris ablaze. An angry crowd seized his body and dragged it through the streets, calling the deceased an infamous atheist and a devil’s henchman. For many, it was certain that this renegade had made a pact with Satan – and that the devil himself had come to claim his soul. Sensational pamphlets circulated immediately, such as the booklet Terrifying Stories of Two Magicians (1615), which tells how two sorcerers – one being Ruggieri – were strangled by the demon during Holy Week. It was even claimed that Ruggieri’s associate, a certain César, was taken by the devil and then imprisoned in the Bastille, mixing fiction with reality in the public mind. The uproar was such that it triggered a superstition crisis in the capital. To calm heated spirits, the Parliament of Paris even exhumed an ancient royal edict banning sorcerers and “undesirable foreigners”: in May 1615, taking advantage of the confusion between witchcraft, blasphemy, and allegedly “impious” rites, it was decided to expel the last members of the Jewish community, convenient scapegoats of this outraged Catholic fervor (already banned from residing in the kingdom of France since their expulsion in 1394). Thus, even after his death, Ruggieri continued to haunt the French court – his spectacular demise marked the end of an era and seemed to close, amid the clamor of popular fears, the dark chapter of the Médicis occultism.
7. The Mage Prophet and His Royal Predictions
Beyond the historical figure, the legend of Cosme Ruggieri has flourished abundantly, mixing verified facts and fantastic tales, to the point that it is sometimes difficult to untangle truth from invention. Many famous prophecies are attributed to him by tradition, although sources differ on the exact identity of the prophet and the details of each prediction. One of the best known remains the prophecy of Catherine de Médicis’s death “near Saint-Germain.” According to some authors, Ruggieri (or, according to other versions, the Italian astrologer Luca Gaurico) warned Catherine that the name Saint-Germain would be fatal to her. The queen, frightened, immediately halted construction of the Tuileries Palace – which adjoined the church of Saint-Germain-l’Auxerrois in Paris – and hurriedly moved in 1572 to a safer new residence, the Hôtel de la Reine. Out of caution, Catherine thereafter avoided any place or person bearing this ominous name. Ironically, this premonition came true in an indirect way: the sovereign died on January 5, 1589, at the Château de Blois, far from any Saint-Germain church, but the priest who gave her last rites was named... Julien de Saint-Germain. Thus, “Saint-Germain” was indeed present at her final moments, fulfilling the prophecy to the great alarm of the court.
8. The Chaumont Mirror and the End of the Valois
Another legendary vision, worthy of an occult tale, is said to have taken place at the Château de Chaumont-sur-Loire, which Catherine de Médicis occupied after Henri II’s death. Toward the end of 1559, despairing about her lineage’s future after her husband’s premature death, Catherine reportedly called on Ruggieri to pierce the veil of destiny. In a high tower overlooking the Loire, on a moonless night, the astrologer is said to have deployed all his art to reassure the queen about her dynasty’s posterity. Chronicles recount that in the heart of a dark room, Ruggieri traced a magic circle and made the faces of Catherine’s three sons appear successively in the blackened mirror of a large glass. One by one, the specters of the young princes – François, Charles, and Henri – materialized before the stunned queen. Each apparition mysteriously spun on itself, making a number of rotations corresponding to the number of years each son would reign. François II, the eldest, made only one turn (he was king for just one year); Charles IX made fourteen; Henri III finally made fifteen. After the fifteenth revolution of the last ghost, the mirror fell inert and no fourth face appeared – a sign that no other son of Catherine would ascend the throne. The vision thus ended with the omen of the Valois’s end. And indeed, in 1589, upon Henri III’s death without an heir, the glorious Valois dynasty ended to make way for the Bourbons and Henri IV, exactly as the Chaumont oracle had foretold. This story is sometimes attributed to Nostradamus, but it is more likely linked to Cosme Ruggieri.
9. Master of the Occult Arts
The gifts attributed to Ruggieri were not limited to the stars. He was said to be a mage of many talents, initiated into various occult arts. Besides astrology, he practiced haruspicy – reading omens in the entrails of sacrificed animals – and mastered the art of magic mirrors to obtain visions. Above all, his name remains linked to the dark technique of enchantments by wax figurines (also called dagydes): by sticking pins into small effigies, he could influence the fate of his victims from a distance. Such practices, halfway between sympathetic magic and witchcraft, horrified as much as they intrigued his contemporaries. Much has also been speculated about Ruggieri’s role in creating poisons or potions for Catherine de Médicis, whose dark legend often blamed her for all secret crimes. At the Château de Chaumont, a room still bears his name and, decades later, curious bottles hidden in a cabinet were shown there. The writer Gabriel-Louis Pringué, visiting the place, imagined seeing the Florentine’s shadow: “Ruggieri composed his poisons there, whose bottles remained locked in his room, while reading, in the stars, the future of France….” This evocation sums up the image left by Ruggieri: that of an occult scholar bent over his alembics at midnight, distilling some frightening brew while constellations bearing destinies parade across the sky.
After his death, Cosme Ruggieri did not fade into oblivion – quite the opposite. His figure, already shrouded in mystery during his lifetime, continued to fascinate subsequent generations. In the 19th century, Romantic writers took up his story and enriched it with new fictions, greatly contributing to mythologizing Ruggieri. Honoré de Balzac, in La Confidence des Ruggieri and Le Secret des Ruggieri (1846), made him a protagonist in his fresco on Catherine de Médicis, inventing an imaginary brother and expanding the character of “Ruggieri the Elder.” Alexandre Dumas, in La Reine Margot, transferred some of Ruggieri’s attributes to another Florentine (the perfumer René), thus integrating the astrologer into the romantic intrigues of the St. Bartholomew’s Day Massacre. Later, other serial novel authors, such as Michel Zévaco, perpetuated his legend by portraying him under barely disguised names. Meanwhile, occultists and esoteric historians regularly mention Ruggieri in their works. The famous Dictionnaire infernal by Collin de Plancy (1863) devotes a long article to him, adopting anecdotes borrowed from Balzac and contemporary chronicles.
Four centuries later, the mention of Cosme Ruggieri remains inseparable from the image of Catherine de Médicis and the atmosphere of a refined occultism of the late Renaissance. Certainly, the real man remains partly elusive – was he a skilled manipulator, a true seer, or a bit of both? – but his legacy is tangible. Both a learned astrologer, political confidant, and legendary sorcerer, Ruggieri left his mark on the history of Western occultism. But perhaps he had already foreseen that...
