In 2010, the most famous corpse in history was slid into a CT scanner, and the machine began to recite the catalogue of what ailed him. The left foot was twisted inward and downward, so badly that the boy would have walked on its outer edge rather than its sole. A hole sat in the roof of his mouth. Malaria still lingered in the marrow of his dried bones.

His jaw receded too far back. His spine was curved. This was Tutankhamun, dead at nineteen, and every one of those defects traced back to a single decision made by his family before he was even born. Start with the foot, because the foot is the injury you cannot explain away or deny.

The left foot was angled in and down, the condition doctors call a club foot. The sole had twisted so severely that the boy would have walked on the outside edge rather than the flat of it. The right foot was not perfect either, flatter than it should have been. But the left one ended any hope of a natural gait.

That alone would have caused a permanent limp, and the scan revealed something far worse buried inside it. In the bones of the midfoot, the tissue had died. Part of the second metatarsal, one of the long bones behind the toes, had been struck by necrosis. The bone was quietly killing itself for lack of blood supply.

The condition has a name, Köhler disease, and it turns every step into something to dread. The second toe was missing a bone entirely, so it appeared shriveled and short beside the others. This was far more than a limp. Every step the boy took landed on bones that were rotting and deforming at the same time, bones that fired pain up his leg whenever they took any weight.

So there is the picture. A living god, worshipped as the son of the sun, physically unable to stand for any length of time without something to lean on. And we know he leaned on something, because they buried him with the evidence. Inside his tomb in the Valley of the Kings, Howard Carter’s team counted more than 130 walking sticks and staffs.

Some were polished smooth from use. Some were designed at a height that allowed them to be placed under the armpit like crutches. Carter, looking at the pile, guessed the young king had simply been a collector. Now there is a more practical reason to believe he needed them.

The sticks were also a symbol of royal authority. Egyptian kings had been depicted holding them for a thousand years. So 130 staffs alone prove no disability. But 130 staffs placed on top of a twisted, rotting foot is an entirely different story.

The foot was only the beginning. It answers the question of the sticks, which raises the obvious one. What does that to a teenager? The easy answer is disease, or an accident, or plain bad luck.

The real answer is colder, and it begins with the one thing everyone knows about this king. He is famous for how he died. The curse, the sudden end, the boy pharaoh gone young. But the story was never really about how he died.

It was about how he was made. Because in 2007, a team led by the Egyptian archaeologist Zahi Hawass did something no one had done before. They extracted DNA from the boy king’s mummy and from ten other royal mummies suspected to be his relatives, and they rebuilt his family tree from the bones themselves. What they found was supposed to be routine.

Instead, it was a bomb. The DNA identified his father with near certainty. A mummy known only by its tomb label, KV 55, most likely Akhenaten, the heretic king who tried to wipe out Egypt’s gods and replace them with a single one. Then they found his mother.

A separate mummy, labeled only “The Younger Lady,” recovered from a side chamber of another tomb. And here the family tree stops being a tree and becomes a closed loop. His father and his mother had the same parents. Both were children of the pharaoh Amenhotep III and his queen, Tiye.

That makes the boy king’s mother and father something a royal marriage was never supposed to be. They were full brother and sister. He was the child of a brother and sister. The team published the results in the Journal of the American Medical Association in 2010.

They drew it straight into the family chart as a single solid line representing a first-degree union. Consider that, because it reshapes everything the scanner found. The foot, the jaw, the cleft in the roof of the mouth. None of it was bad luck.

A genome folding in on itself produces exactly this kind of defect. And his genome was folded as tightly as a human genome can be folded. But brother-sister marriage was not a scandal in this house. It was policy.

For generations, the pharaohs of the Eighteenth Dynasty had deliberately married their sisters and half-sisters. The legend said the gods married each other’s blood, so the gods’ kings on earth did the same, to keep the sacred line pure and the throne inside the family. The boy’s grandfather had not stopped at his own generation. He had also taken at least two of his daughters as wives.

Later, the boy himself would marry his own half-sister. Layer upon layer, the same few individuals married again and again within the same narrow circle. Each union pulled the knot tighter. Genetically, the tightest knot has a specific number.

Scientists measure it with something called the inbreeding coefficient: the probability that the two copies of a gene you inherit are identical because they trace back to the same ancestor twice. For a child of unrelated parents, the number is near zero. For the child of a full brother and sister, it theoretically rises to about 0. 25.

Now compare that number to the most famous case in European history. Charles II of Spain, the last of the Spanish Habsburgs, the king so genetically wrecked by generations of the same practice that he could barely chew his food or father a child. When scientists rebuilt his family tree in 2009, his coefficient came out to 0. 254.

The reason it exceeds the full-sibling level is that his relatives’ inbreeding was not a single event. It was cumulative, stretching across sixteen generations, each consanguineous marriage building on the one before it. The boy pharaoh and the bewitched king, two dead ends on two continents, separated by three thousand years, resting on nearly the same broken math. And because Egypt had been repeating the same loop for generations before Tutankhamun was born, his real number may have been higher still.

There is an honest caveat here, and it matters because it is the kind of objection that gets raised. No one has ever calculated a precise coefficient from the boy king’s own DNA the way they did for the Spanish king. His 0. 25 is inferred from being the son of a brother and sister, not measured from his genome.

The French Egyptologist Marc Gabolde argues that the parents were cousins, not siblings, and that they only looked like siblings in the DNA because the family had been inbreeding for so many generations before them. Either way, the arrow points in the same direction. This was a bloodline collapsing on itself. Now return to that scanner, because the foot was just the start of what it found.

The roof of his mouth had never closed properly. There was a partial cleft palate, a gap in the bony plate at the top of the mouth, the same defect the scans spotted in his father’s skull. His lower jaw was set back too far, prominent enough to show up in the entire family’s portraits. The Amarna dynasty’s own version of the famous Habsburg jaw.

That word, portraits, opens the door to the strangest part of this entire story. Because for a long time, art was the evidence. The statues and reliefs of his father, Akhenaten, show something that disturbs people to this day. Hips as wide as a woman’s, soft swollen breasts, a long drooping skull, slender limbs.

His entire family was carved in the same way, half male and half female, stretched, bent, and unnatural. For more than a century, scholars looked at that and tried to make a medical diagnosis. Marfan syndrome, some said, the disorder that makes people tall with long limbs. Others guessed rarer conditions, hormonal disorders, a body that could not decide whether it was male or female.

So the 2010 team went looking for those specific diseases in the DNA and the bones, and they found nothing. No Marfan. No trace of the syndromes that might explain the feminine art, or the strange elongated skull the statues obsessed over. The real Tutankhamun did not even have one.

His head was ordinary. It turned out the strange bodies in the carvings were mostly an artistic style, a religious way of depicting the divine king, not a medical portrait. Which is worse, in a way. The deformities everyone could see, carved into stone for three thousand years, were mostly a matter of style.

The damage that actually crippled him never appeared in the art at all. It lay in a decaying foot, a cleft palate, a deformed jaw, and in something no sculptor could have depicted because it moved quietly through his blood. When they examined the royal mummies for disease, they found the genetic fingerprint of malaria. Not a trace, not a possibility.

The DNA of Plasmodium falciparum, the deadliest malaria parasite of all, was present in the boy king and in at least three of his relatives. To this day, it remains among the oldest genetically confirmed cases of malaria ever extracted from a human body. So imagine the full list now. A king who could not walk without support, could not bite properly, carried a hole in his skull, and had a lethal parasite in his blood, all before he turned twenty.

Put it all together and you have a body that was never supposed to reach adulthood. It was barely holding together. And it did not hold together for long. For years, the ruling theory was murder.

A dark spot on an old X-ray of his skull looked like a blow to the back of the head. The story took hold that the boy king had been assassinated. But the scans ended that theory. There were no blood clots around the loose bone fragments inside his skull, which meant the damage happened after death, during mummification, or when the mummy was handled centuries later, not at the hand of a killer.

What the scans did find inside him was a fracture in his left thigh, just above the knee. A fresh break that embalming fluid had leaked into, which tells you it happened very close to the time of death, not long afterward. An open fracture like that, in a boy of fragile constitution, is an open door for infection. So the 2010 team put the sequence together like this.

A body already betrayed by its own genetic makeup. A foot with dead bone that made him unsteady when he walked. A fall or accident that broke his leg. And malaria moving through his blood to finish what the fracture had begun.

There was no curse and no assassin. Just a boy who was never meant to survive his own biology, finally finished off by a stumble and a mosquito. Even that conclusion is disputed. Some researchers argue malaria rarely kills a young man who had certainly survived it before.

They point instead to a genetic blood disorder such as sickle cell disease as the cause that ended his life. Others insist on a chariot accident or something stranger. They all argue over the final moments of a life that had been heading toward its end from the very beginning. Because this is the part that should have ended the bloodline.

But it did not end it. It tried to continue. Inside his tomb, placed in a plain wooden box, they found two tiny coffins. Two mummified infant girls, both dead in the late stages of pregnancy, one around the fifth month, the other around the eighth.

The DNA tests reached these two children as well. They were his daughters, and their mother was most likely Ankhesenamun, daughter of Akhenaten, which made her the boy king’s half-sister. So the child born of a brother and sister went on to marry into the same pattern and tried to build a family within its frame. Two daughters, neither of whom ever breathed.

They were buried at their father’s feet. The last buds of a family tree that had spent generations strangling itself, until it finally finished off the most powerful person on earth, leaving no living heir to take the throne. And so the dynasty ended completely. When the boy king died, there was no son to take the crown, no daughter who survived him.

A royal line that had ruled Egypt for two centuries, that had built temples and empires, that had worshipped its own blood as sacred, found in the end that it had no bodies left to carry it on. The throne passed to an aging court official, then to a general, men with not a single drop of that sacred blood in their veins. The family had married each other for generations to keep the bloodline pure. In the end, there was no bloodline left to protect.

That is the truth the golden mask was made to hide. The most famous face of the ancient world belonged to a boy who limped and ached and bled through all nine years of his reign, destroyed not by an enemy or a curse but by the throne itself. His family had married their way to power for generations, and so the wealth, the crown, and the sacred pure dynasty, and the dead bone in his foot, were all chapters of the same story. And the strangest part is that we are still arguing over his body three thousand years later.

Whether his foot was truly deformed, whether malaria killed him, whether his parents were siblings or cousins, he cannot speak for himself. So the bones remain under examination, being read and debated. He is one of the most examined corpses on the planet, and he still refuses to give a straight answer about how a golden boy ended up so broken.