THE CITY THAT BECAME SPLIT
How the Fall of Salona Gave Birth to Modern Split
Around 614 AD Salona fell to Avar and Slavic invasions — and its refugees fled into Diocletian's Palace, founding the city that stands there today.
See Salona tours on GetYourGuide ↗A capital under pressure
By the early 7th century, Roman control over the Balkans was collapsing under pressure from Avar and Slavic incursions, and Salona — still a major city and the administrative heart of Dalmatia — sat directly in the path of that collapse. The exact sequence of events is debated among historians, and the sources that survive were mostly written well after the fact, but the broad picture is agreed on: a city that had stood for the better part of a millennium was overrun and effectively destroyed. Traditional accounts date the fall to around 614 AD, though modern scholars treat that as an approximate date rather than a confirmed one, since the archaeological and textual evidence doesn't pin it down precisely.
Where the survivors went
What happened next is the more remarkable part of the story: Salona's population didn't simply vanish. Survivors fled the ruined city and found shelter about six kilometres down the coast, inside the massive, fortified walls of Diocletian's Palace — the retirement residence Salona's own most famous son had built roughly three centuries earlier. Those walls, designed to protect one retired emperor and his household, turned out to be exactly what a displaced population needed: a defensible perimeter with existing infrastructure they could adapt. It's one of the more direct lines in European urban history between a building's original purpose and what it eventually became.
From mausoleum to cathedral
Refugees didn't just camp inside the palace walls — they rebuilt a functioning city within them, and their Christian identity travelled with them from Salona intact. Diocletian's own mausoleum, ironically the tomb of an emperor who had persecuted Christians during his reign, was converted into a Christian cathedral, and the relics of Salona's martyred bishop, Domnius, were moved there. Streets, houses and later buildings grew up wedged between and against the palace's original Roman walls, columns and passages — a pattern of reuse still visible in Split's old town today, where medieval and modern buildings sit directly against Diocletian-era stonework, because that's literally how the city was assembled, one refugee household at a time.
What was lost, and what carried over
Salona itself was never rebuilt at scale — the site was gradually abandoned, stripped for building stone over the following centuries, and left to fields and grazing land, which is largely why so much of its footprint survives to be excavated today rather than lying buried under a modern city. But the things that mattered most about Salona didn't disappear: its bishopric, its saints, its Christian institutions and much of its population transferred into the new settlement at Split. In a real sense, Split isn't a new city that happened to be built near Salona — it's Salona's continuation under a different name, inside a different set of walls.
Seeing the continuity for yourself
The clearest way to grasp this story is to visit both places in the same day: Salona's open fields and empty amphitheatre show you the scale of what was lost, while Split's old town — its cathedral, its narrow lanes threaded through Roman corridors — shows you what the refugees built from the wreckage. Look for the cathedral's octagonal shape, still recognisably Diocletian's mausoleum beneath the later bell tower, and for the substructures beneath the palace that once supported the emperor's private apartments above. Salona explains why Split's old town looks the way it does; Split shows you where Salona's story actually ended up.
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