What Rome's Five Good Emperors Can Teach Us About Estate Planning

In 193 AD, the Roman Empire had five emperors in a single year. Pertinax lasted eighty-seven days. Didius Julianus bought the throne at auction, then died sixty-six days later. Septimius Severus marched on Rome, killed the competitors, and took the purple. The Year of the Five Emperors wasn't a freak event. It was what happened when the system for transferring power broke down. The century before had been different. Nerva took the throne in 96 AD, already older, already without a biological heir. He adopted Trajan—a capable general, not his blood relative. Trajan later adopted Hadrian on his deathbed. Hadrian adopted Antoninus Pius, who then adopted Marcus Aurelius. Five emperors, none father to son, each chosen for competence. Historians call them the Five Good Emperors. Edward Gibbon wrote that their reigns marked the period in history when "the condition of the human race was most happy." The system worked because adoption functioned as a contract: the successor earned the position, and the position went to someone who could actually do the job. Then Marcus Aurelius broke the pattern. He handed power to his biological son, Commodus—a man whose main interests were gladiatorial combat and renaming Rome after himself. The empire fell into chaos within a decade. I spend my days reading documents that people assumed would be clear enough when the time came. Wills, trusts, powers of attorney. Most of them are drafted with good intentions and vague language. "Divide my estate fairly among my children." "My daughter should receive the family business if she remains involved." Phrases that feel adequate in the attorney's office. Phrases that become battlegrounds when someone dies. The parallel to Rome is uncomfortable but clear. We treat biological inheritance as the default. We assume children will be appropriate heirs because they are children. Rome proved that assumption wrong at the cost of legions and provinces. Modern families prove it wrong at the cost of relationships and savings. Probate litigation has risen steadily in North America over the past two decades. The American College of Trust and Estate Counsel has tracked increasing contest rates, particularly in blended families and when substantial assets are involved. The fights rarely center on the money itself. They center on what the deceased "really wanted." Ambiguity is the fuel. Once the testator is gone, everyone becomes an interpreter. Nick Szabo defined smart contracts in 1994 as digital protocols that execute the terms of an agreement automatically. The concept predates blockchain, but distributed ledgers gave smart contracts something they needed: a settlement layer that doesn't require a trusted intermediary. A will is a contract between the living and the dead. The problem has always been the intermediary. Courts, executors, attorneys—each one a point where interpretation enters and costs accumulate. A smart contract for inheritance could specify: if X conditions are met, transfer Y assets to Z address. The conditions might include reaching a certain age, completing specific milestones, or simply surviving the testator by a defined period. The execution happens without petition, without hearing, without attorney fees deducted from the estate. The blockchain doesn't care about family dynamics. It doesn't interpret. It executes. The Roman adoptive system had its own enforcement mechanism. An adopted heir who proved incompetent faced assassination or civil war. Brutal, but effective as a screening process. Smart contracts offer a different kind of finality. Once deployed, the terms are visible to all parties. No one can claim surprise. No one can argue that the deceased "changed their mind" without updating the contract. The ledger becomes the single source of truth. Estate attorneys will object that this removes flexibility. A will can be amended. A trust can be modified. A smart contract, once deployed on certain blockchains, is immutable. This is a feature, not a bug. The Five Good Emperors worked because adoption created a binding commitment that neither party could easily unwind. The moment Commodus was named heir by blood, flexibility returned—and with it, disaster. I have watched families spend more fighting over ambiguity than the disputed assets were worth. I have seen siblings stop speaking because one believed the parents "intended" something different than the document said. The document always says less than anyone thinks. Attorneys draft for what clients can imagine. Death brings circumstances no one imagined. The Romans learned, through a century of relative stability, that succession by contract beats succession by blood. They learned it at the scale of an empire. Modern families can learn it at the scale of a savings account and a vacation home. The mechanism matters more than the assets. A system that rewards capability over proximity, that binds the testator to their own stated terms, that removes interpretation from the process—that system prevents the wars. Commodus was strangled in his bath on December 31, 192 AD. The empire his father had spent a lifetime securing collapsed into auction and civil war within months. The lesson was not that biological heirs are always bad. It was that default settings are dangerous. Rome's best century came from choosing successors deliberately, contractually, with the empire's survival as the explicit criterion. Most families are not empires. But the same principle applies. A will that defaults to blood relations without considering capability is not a plan. It is a gamble with someone else's money and someone else's future relationships. The Romans showed how to do better. The technology now exists to make it stick.