The Roman Emperor Who Retired to Split - And Never Looked Back

Walk through the Golden Gate of Diocletian's Palace in Split, Croatia, and you enter one of the strangest and most extraordinary places in Europe. Not a ruin. Not a museum. A neighborhood.

Coffee shops occupy spaces where the emperor's servants once worked. Laundry hangs between columns that have stood for seventeen centuries. Cats sleep on Roman stonework. Residents lean out of medieval windows built into ancient walls. At the center of it all, a cathedral rises from what was once an emperor's mausoleum — the man's own tomb, converted to Christian worship within a century of his death, still functioning as a place of worship today.

Diocletian's Palace is the only Roman imperial residence still fully inhabited. It has been continuously occupied for more than 1,700 years. The city of Split did not grow up around the palace. It grew up inside it.

Understanding why that happened - and understanding the man who built the palace in the first place - turns a visit to Split from a pleasant afternoon into something considerably more interesting.

The Emperor Who Planned His Retirement While Still in Power

Gaius Aurelius Valerius Diocletianus - Diocletian - seized power in 284 AD in circumstances typical of the era: his predecessor had been murdered, he was the leading military candidate, and he moved quickly enough to consolidate before rivals could organize against him. What followed was anything but typical.

He found a Roman Empire that had spent fifty years in near-continuous civil war, economic collapse, and external invasion - the Crisis of the Third Century, during which Rome had cycled through more than fifty emperors, most of whom died violently. The administrative machinery that Augustus had built was still functioning, but barely. The currency had collapsed. The frontiers were under sustained pressure from Germanic tribes in the north and the Sassanid Persian Empire in the east. The army, which had become the primary political institution, was simultaneously Rome's greatest asset and its greatest source of instability.

Diocletian spent twenty-one years systematically rebuilding the state. He introduced the Tetrarchy - dividing imperial power among four rulers, two senior Augusti and two junior Caesares, each responsible for a different region - on the grounds that the empire was simply too large and too complex for a single man to govern from a single capital. He reorganized the provinces, doubling their number to reduce individual governors' power. He reformed the tax system, the army, the bureaucracy, and the currency. The reforms were not all successful and not all permanent, but their scope was extraordinary: the most ambitious administrative overhaul the empire had seen since Augustus.

And throughout this period - beginning around 295 AD, more than a decade before he actually retired - he was building himself a palace on the Dalmatian coast.

This was not a vanity project or an afterthought. Diocletian was born near the site, in the Roman province of Dalmatia, from modest origins - his father may have been a scribe or a freedman, his early life in the military before his rapid rise through the officer class. He was building his retirement home on his home soil, and he was doing it while still in power because he intended, from relatively early in his reign, to actually use it.

No Roman emperor before him had planned a voluntary abdication. The precedent did not exist. Diocletian created it.

What He Built

The palace at Spalatum - the Latin name for the site, from which "Split" derives - was completed around 305 AD. It was not, strictly speaking, a palace in the sense of a single grand building. It was something between an imperial villa and a military fortress, and the combination was entirely deliberate.

The complex covered approximately 30,000 square meters - roughly three hectares - in a rectangular plan approximately 215 meters wide by 180 meters deep. The walls rose to as much as 26 metres in height, reinforced by towers at regular intervals, with the sea forming the southern boundary and three landward gates - the Golden Gate to the north, the Silver Gate to the east, the Iron Gate to the west - providing controlled entry points. A fourth gate, the Bronze Gate, opened directly onto the sea on the southern facade.

The interior was divided by two main streets - the cardo running north-south and the decumanus running east-west - following the Roman military camp layout that Diocletian would have known from decades of service. The northern half housed the military garrison, service quarters, and support facilities. The southern half contained the imperial apartments and the ceremonial spaces where Diocletian would receive visitors and conduct whatever public business retirement required.

At the center of the southern half, the Peristyle - a colonnaded courtyard open to the sky - served as the main ceremonial space, the place where the emperor appeared before petitioners and performed the formal rituals of imperial dignity. It is now an open-air square with café tables and a remarkable concentration of Roman stonework. On summer evenings it serves as an outdoor performance venue. The acoustics, as the original designers apparently understood, are exceptional.

The mausoleum - Diocletian's own intended tomb, an octagonal structure of considerable architectural ambition - was built immediately east of the Peristyle. The Temple of Jupiter stood to the west, balanced and formal, serving the religious requirements of an emperor who was a devoted worshipper of Jupiter Optimus Maximus.

The whole complex could house up to 9,000 people. It was not designed for a solitary retirement. It was designed as a self-sufficient small city in which an ex-emperor could live with appropriate staff and security, removed from power but not from dignity.

The design reflects the same mind that created the Tetrarchy: systematic, hierarchical, clear about what each element was for, built to last. Diocletian designed his home the way he designed everything else - with total, unsentimental clarity about its purpose and an absolute refusal to compromise on quality of execution.

The Abdication

On May 1, 305 AD, at a ceremony in Nicomedia in modern Turkey, Diocletian abdicated. His co-emperor Maximian abdicated simultaneously, in Milan. The Tetrarchy's two senior rulers stepped down together, their two junior Caesares stepping up to replace them, a peaceful transfer of power of a kind the Roman world had never seen.

Diocletian was approximately sixty years old. He had ruled for twenty-one years. He returned to his palace in Split and began his retirement.

What followed was, by all accounts, genuinely quiet. He gardened. He tended the grounds of his palace with an attention he had previously reserved for the reorganization of the Roman state. He received visitors. He refused invitations to return to public life with a consistency that suggests genuine satisfaction rather than diplomatic deflection.

When the Tetrarchy he had constructed collapsed into civil war - which it did, almost immediately, as his successors proved unable to maintain the cooperative arrangement he had designed - delegations came to beg him to return. His refusal, as recorded by the historian Lactantius, became one of the most famous statements in the history of retirement: he replied that if only they could see the cabbages he had planted at Spalatum with his own hands, they would not ask him to trade that satisfaction for the pursuit of power.

The cabbages story is usually told as charming eccentricity. It is actually a precise expression of character. Diocletian understood power with unusual clarity - what it required, what it cost, and when it was time to leave it. The man who had reorganized the Roman Empire had no illusions about what returning to its politics would mean. He had built himself a life worth living. He lived it.

He died at Spalatum sometime around 311–313 AD, having spent the last several years of his life in the palace he had spent the previous decade building. He was buried in his mausoleum, as planned.

What Happened Next: 1,700 Years of Continuous Life

After Diocletian's death, the palace passed through various imperial uses - a residence for deposed emperors, a repository for the remains of earlier rulers relocated from Rome, a military installation. As the Western Empire weakened through the fourth and fifth centuries, its strategic value on the Dalmatian coast grew. When the Western Empire finally collapsed in 476 AD, the palace became an administrative center under the Ostrogothic king Theodoric.

The transformation that made the palace into the city it is today began in the seventh century. Avar and Slav invasions of the Dalmatian interior drove Roman refugees from the surrounding region into the palace's walls. The fortifications that Diocletian had built for his own protection became a refuge for an entire population. The refugees moved in and did not leave.

They built homes inside the imperial apartments. They converted the temples to Christian worship - the Temple of Jupiter became a baptistery, which it remains today. Most significantly, they converted Diocletian's mausoleum into a Christian cathedral, dedicated to the Blessed Virgin Mary and later to Saint Domnius, the Bishop of Salona who had been martyred during Diocletian's own persecution of Christians. The irony is precise and apparently untroubled the medieval inhabitants: the most systematically organized pagan emperor's tomb became a Christian cathedral, and the man whose policies had produced Christian martyrs lay buried beneath the altar of their church for centuries before his remains were finally removed.

The medieval city of Spalatum (Split, now in Croatia) grew entirely within the palace walls. The Roman street grid became the medieval street plan. Roman foundations became medieval foundations. The walls that had defined Diocletian's residence defined the city's perimeter. By the high Middle Ages, the palace's structure and the city's structure were inseparable.

They remain so. UNESCO designated the Historic Centre of Split, with Diocletian's Palace at its core, a World Heritage Site in 1979. Approximately 3,000 people live within the palace walls today. The Roman grid is still legible in the street plan. The Peristyle still hosts the city's social life, as it has done in various forms for seventeen centuries.

What to See When You Visit

The underground cellars are the essential starting point. Because medieval inhabitants built directly on top of the Roman ground floor rather than clearing it, the substructure of the palace is remarkably preserved - vaulted corridors and chambers that give the clearest surviving picture of what a Roman imperial palace actually looked like at the structural level. Game of Thrones filmed scenes here, which has introduced a new generation of visitors to spaces that deserve attention on their own considerable merits.

The Peristyle rewards time. Early morning, before the tour groups arrive, is when it is most legible as the ceremonial space it was - the proportions of the colonnades, the quality of the stonework, the relationship between the space and the cathedral that rises from the mausoleum at its eastern end. Later in the day it becomes a café terrace. Both versions are worth experiencing.

The Cathedral of Saint Domnius - Diocletian's mausoleum - is among the oldest cathedral buildings in the world still in continuous use. The campanile, added in the medieval period, offers the best elevated view of the palace complex and the city that grew within it. Inside, the original octagonal structure of the mausoleum is clearly readable beneath the medieval and baroque additions.

The Golden Gate, on the northern facade, is the best preserved of the three landward gates and the most imposing. Outside it stands the statue of Gregory of Nin, the tenth-century bishop who championed the use of Croatian rather than Latin in the liturgy - his large bronze toe, polished bright by generations of visitors seeking good luck, has become one of Split's most photographed details.

But the most rewarding thing to do in Diocletian's Palace is simply to walk. Get away from the main tourist routes, into the residential streets where the medieval street plan follows the Roman grid and the buildings rise from foundations laid seventeen centuries ago. The palace is most itself not in its grand spaces but in its ordinary ones - the narrow lanes, the unexpected courtyards, the walls that have been Roman and medieval and Ottoman and Venetian and Yugoslav and now Croatian, all in the same stones.

The Man Behind the Place

Diocletian's Palace tells you something about its builder that his administrative reforms and military campaigns do not. The reforms tell you what he was capable of. The palace tells you what he valued.

He was capable of reorganizing the most complex political entity in the Western world. He valued a garden in Dalmatia, the place he had come from, tended with his own hands. He was capable of holding power over the entire Roman Empire. He chose to give it up before it was taken from him, which no one had done before and almost no one has done since.

The palace is still there. The cabbages are long gone. But the judgment they represented - that a life well-chosen matters more than a reign without end - is written into every stone of the place he built to live it.

Diocletian is part of the Rome's Greatest Emperors collection - museum-quality portraits of the men who built, defended, and transformed the ancient world. [Explore the collection →]