Yes, multiple ancient sources describe Julius Caesar experiencing seizures, particularly in the final two years of his life. The Roman biographer Suetonius wrote that Caesar “was twice attacked by the falling sickness,” while Plutarch described him as having “distemper in the head” and being “subject to epileptic fits.” A third historian, Appian, also referenced Caesar’s “epilepsy and sudden convulsions.” While the diagnosis of epilepsy has been accepted for centuries, modern researchers have proposed alternative explanations for what was actually happening to him.
What the Ancient Sources Describe
The most detailed accounts come from Plutarch and Suetonius, both writing decades after Caesar’s death but drawing on earlier records. Suetonius noted that “towards the end he was subject to sudden fainting fits and to nightmares as well.” Plutarch was more specific about timing and location, stating that the fits “first attacked him in Corduba,” a city in Spain. A second episode struck near the North African city of Thapsus during or just after a battle in 46 BC. Both incidents occurred when Caesar was in his mid-fifties.
Plutarch described behavior that modern neurologists have interpreted as a type of seizure involving altered consciousness, using the Latin phrase “repente animo relinqui,” meaning he was suddenly overcome or lost awareness. At Thapsus, Plutarch states Caesar had a seizure in the midst of fighting. Shakespeare dramatized these accounts centuries later, having a character describe how Caesar “swooned and fell down” in the marketplace, “foamed at the mouth, and was speechless.” While Shakespeare took artistic liberties, the foaming and loss of speech are consistent with what Plutarch and Suetonius recorded.
There is some disagreement about exactly when the first episode happened. Caesar visited Corduba twice: once in 49 BC at the start of the civil war and again in 45 BC near its end. Some historians place the first seizure in 49 BC, when Caesar was about 51, while others date it to the later visit. Either way, the episodes appear to have begun late in life, which turns out to be an important clue.
Why “Epilepsy” Became the Default Answer
For most of history, the assumption has been straightforward: Caesar had epilepsy. The Romans themselves called it “morbus comitialis” (the disease of the assembly), and in the ancient world epilepsy was known as the “Sacred Disease” because its dramatic physical symptoms inspired superstitious awe. Having epilepsy would not necessarily have been politically damaging for Caesar. In a culture that associated the condition with the divine, it could even have reinforced his image as someone touched by the gods.
A genetic argument supports the epilepsy theory. Caesar’s father and great-grandfather both died suddenly and unexpectedly. Pliny the Elder recorded that Caesar’s father died while putting on his shoes, as did another relative. Some neurologists have suggested these sudden deaths could represent a phenomenon known in modern medicine where people with epilepsy die unexpectedly, and that the condition ran in the family through the Julio-Claudian line.
The Mini-Stroke Theory
Not everyone is convinced epilepsy is the right diagnosis. A team of researchers at Imperial College London proposed that Caesar actually suffered a series of mini-strokes, which are brief episodes where blood flow to the brain is temporarily blocked. Their argument rests on a few key points.
First, it is unusual for epilepsy to appear for the first time in a person’s fifties. Caesar was remarkably fit well into middle age, with no record of seizures during his younger years. Late-onset episodes are more consistent with cardiovascular problems. Second, the ancient sources describe a broader set of symptoms than seizures alone: limb weakness, dizziness, headaches, body trembling, difficulty holding papers, and personality changes including depression and unpredictable behavior. All of these are compatible with repeated mini-strokes affecting different parts of the brain.
The family history works for this theory too. Those sudden deaths of Caesar’s father and relative could point to inherited cardiovascular disease rather than epilepsy. A genetic tendency toward blood clots or unstable blood vessels would explain both the sudden deaths in the family and Caesar’s own late-life episodes.
The Brain Tumor Hypothesis
A third possibility was raised by researchers who looked at the full picture of Caesar’s declining health: a slow-growing brain tumor. This theory draws on the combination of late-onset seizures, worsening headaches, and notable personality changes in the last two years of his life. A tumor pressing on brain tissue could produce all three symptoms, with seizures becoming more frequent as the tumor grew.
Researchers examined surviving busts, statues, and coins bearing Caesar’s likeness, looking for any visible skull deformity that might hint at a large tumor near the surface of the brain. They found none, but acknowledged that many types of tumors would not produce visible changes to the skull. Without physical remains to examine (Caesar was cremated), a definitive conclusion is impossible. Still, the combination of symptoms fits the profile of certain slow-growing tumors that are more common in middle-aged and older adults.
What We Can and Cannot Know
The honest answer is that Caesar almost certainly experienced some form of neurological episodes, but we cannot determine the exact cause with the evidence available. The ancient accounts were written by biographers, not physicians. They filtered Caesar’s health through political narratives, cultural assumptions about the “Sacred Disease,” and secondhand reports. None of the surviving sources describe his symptoms with the clinical precision that would let a modern doctor make a confident diagnosis.
What we do know is that something changed in Caesar’s body during his fifties. A man who had spent decades leading armies across Europe, surviving harsh campaigns, and maintaining a punishing political schedule began experiencing episodes of collapse, loss of awareness, and physical weakness. These episodes were public enough and dramatic enough that multiple historians recorded them independently. Whether the underlying cause was epilepsy, cardiovascular disease, or a brain tumor, the seizures themselves were real, and they marked the final chapter of a life that ended by assassination just two years after the symptoms began.