Charleston, South Carolina is literally a name on the map that points back to King Charles II, the Restoration monarch honored when “Charlestowne” was founded in 1670 and later evolved into modern Charleston. When people ask me, “What did Charles the Second die of…,” they’re stepping into a story that feels half medical mystery and half cautionary tale: King Charles suffered a sudden collapse, then endured five days of aggressive 17th-century medicine—seizures, brief rallies that looked like recovery, and a steady slide into exhaustion—until he died on February 6, 1685, and was buried on February 14 at Westminster Abbey. That tight timeline is one reason the episode stays so memorable: the court kept unusually detailed notes, and later historians have been able to reconstruct both the symptoms and the staggering “treatment” thrown at him.

So what did King Charles actually die of? The honest answer is that historians and physicians still debate it, because the evidence supports several overlapping theories. One old rumor—powered by his reputation for hard living—was that King Charles died of syphilis, since his court was infamous for sexual permissiveness and he was widely caricatured as a man of pleasure. But modern medical analysis tends to be skeptical of a neat “syphilis explains everything” conclusion, especially because the physical marks described around his final illness could also reflect gout, chronic inflammation, and the damage caused by blistering and cupping. The official-sounding label “apoplexy” (a stroke) also appears in discussion of his death, yet his repeated seizures and fluctuating alertness don’t align with a single sudden stroke event. A widely discussed modern interpretation is kidney failure (sometimes linked to long-standing gout), where toxin buildup can trigger confusion and convulsions—exactly the kind of crisis that would be dangerously worsened by dehydration from bleeding, purging, and constant enemas.

That uncertainty gets even more interesting when you remember King Charles had a serious hobby that wasn’t all parties and wine: alchemy and experimental “chemistry.” He maintained a laboratory and liked to tinker with substances and reactions, which helps explain why “poisoning” keeps resurfacing as a theory. Some retellings even speculate about mercury exposure because mercury was commonly used in early modern experiments and medicines, though strong proof that it killed him is lacking; what is clearer is that the medical team’s own pharmacopeia included an astonishing range of ingredients, and later writers point out that some plant-based compounds in the era were outright toxic. In other words, even if King Charles didn’t poison himself in the lab, his doctors were perfectly capable of overwhelming a failing body with “remedies” that added poisons into his sytem.

The five-day ordeal began on Monday, February 2, 1685, when King Charles abruptly collapsed with convulsions. His physicians worked from the anchent Greek theory of healing, humoral theory—the belief that illness came from imbalance among bodily fluids and that health could be restored by removing excess—and they acted fast: heavy bloodletting, purging, and repeated clysters (enemas) to “clear” the system. On top of that, they used cupping and blistering—deliberately raising painful blisters as a way to draw sickness outward—and even applied harsh materials to the skin and feet as part of the detoxifying logic. The scene at court was crowded: dozens of medical men and attendants, often summarized in later accounts as “50 royal doctors,” cycling through a regimen that was meant to save a king but functioned like a systematic draining of strength.

On Tuesday, February 3, King Charles reportedly seemed improved—an apparent rebound that, in a gentler world, might have been the moment to stop. Instead, the interventions continued, because improvement was taken as proof the approach worked. More bleeding and more purges followed, along with additional compounded drinks and powders meant to stimulate recovery and keep the humours in check. The problem, as modern reviewers point out, is that if the underlying issue was kidney failure or systemic collapse, repeated fluid loss would push him closer to death, not away from it.

By Wednesday and Thursday, February 4–5, the notes and later summaries grow darker: seizures returned, and treatments became increasingly elaborate and, to modern eyes, bizarre. One widely repeated detail is that King Charles was given concoctions that included ground human skull, a period remedy sometimes used for convulsions, alongside an ever-growing parade of “restoratives” and purges. At the same time, cupping and blistering left his body marked, and extreme topical applications were used—including pigeon droppings applied to his feet in at least one account of the deathbed routine. Whether you frame this as tragic misunderstanding or sincere medical urgency, it’s hard to miss the emotional reality: King Charles was not quietly “resting”—he was being worked on constantly, as if the body could be forced back into balance through sheer intensity.

Friday, February 6, 1685 was the end. King Charles deteriorated into profound weakness and died that day, closing a 25 year reign that had defined the Restoration era. One of the most striking conclusions from modern medical historians is blunt: his doctors likely hastened his death, even if they couldn’t have cured the underlying disease with the knowledge of the time. And that’s what keeps the question “What did Charles the Second die of…” alive—because the answer may be as much about the treatment as the illness itself, with dehydration, stress, and relentless intervention pushing a faltering body over the edge.

Afterward, the story moved from sickbed to ceremony. King Charles was buried on February 14, 1685, in Westminster Abbey, in a vault in Henry VII’s chapel. That date matters for Charleston’s namesake narrative because it pins the timeline precisely: five days of crisis, death on February 6, burial on February 14—an ending that contrasts sharply with the king’s larger-than-life image as a convivial drinker, a magnetic ruler of a glittering court, and an eager amateur alchemist. In the end, Charleston remembers the name, but the death of King Charles preserves the lesson: history isn’t only crowns and colonies—it’s also the very human reality of bodies, beliefs, and the perilous gap between “best practice” and true healing.