Dalmatia (Roman province)

• 1. Introduction

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  Dalmatia, the Roman province, takes its name from the Dalmatae, an Illyrian tribe who lived along the central eastern coast of the Adriatic Sea. Long before any Roman administrator set foot there, the Greeks called the region Illyria. The Romans borrowed that name, then changed it, then changed it again as their power expanded and the map of the ancient world was redrawn around them. What emerges is a story of an enormous territory, stretching across what is now Croatia, Bosnia and Herzegovina, Montenegro, Serbia, and the northern part of Albania, that passed through three centuries of Roman rule before becoming one of the last fragments of the western empire to slip from Rome's grasp. How did a coastal Illyrian tribal homeland become a province? Who governed it, who rebelled against it, and who finally tore it away? The answers wind through piracy raids on northern Italy, a massive rebellion that shook Augustus himself, and a remarkable series of fifth-century commanders who refused to simply let Rome die.

• 2. From Illyria to Illyricum

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  Three wars fought between 229 BC and 168 BC set the stage for Roman control of the region. Those conflicts, known as the Illyrian Wars, were directed mainly against the kingdom of the Ardiaei in the southern part of the region. When the Romans finally abolished that kingdom in 168 BC, they broke it into three separate republics, turning a sovereign state into a patchwork of client communities under Roman oversight. The area formally became a protectorate.

  Piracy was the trigger for deeper involvement further north. The central and northern sections of the Adriatic coast were raiding northeastern Italy, and Rome could not ignore that threat. Octavian, not yet emperor but already the most powerful man in the Roman world, launched a series of campaigns in Illyricum between 35 and 33 BC. His campaigns pushed Roman authority deep into the interior.

  By around 27 BC the region had been designated a Roman senatorial province under the name Illyricum. That arrangement lasted only until troubles in the northern part of the region between 16 and 10 BC forced a reclassification. Illyricum became an imperial province, answering directly to the emperor rather than to the Senate. The administrative reorganization of Illyricum unfolded across the late reign of Augustus, who ruled from 27 BC to 14 AD, and continued into the early years of Tiberius, who reigned from 14 to 37 AD.

• 3. The Batonian War

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  Between 6 and 9 AD the province of Illyricum erupted. The rebellion that historians call the Bellum Batonianum, or the Batonian War, was described by ancient sources as the most dangerous revolt Rome had faced since the wars against Carthage. Its scale forced a reorganization that would eventually split Illyricum into two smaller provinces.

  The first-century Roman historian Velleius Paterculus recorded that Gaius Vibius Postumus served as military commander of Dalmatia under Germanicus in 9 AD. That reference is the earliest surviving written evidence that Illyricum was already being understood as comprising two distinct zones: Dalmatia to the south and Pannonia to the north. The name Dalmatia, borrowed from the Dalmatae tribe, had replaced the older coastal designation.

  The precise moment when Illyricum was formally dissolved into two provinces remains debated. A statue base of Nero, erected between 54 and 68 AD, carries an inscription noting it was set up by a veteran of a legion in Pannonia, which one scholar, Kovac, reads as the first material evidence of a separate Pannonia. Against that, another scholar, Sasel-Kos, points to a governor of Illyricum attested under Claudius, who reigned from 41 to 54 AD, and to a military diploma dated to July 61 AD that lists auxiliary units from the Pannonian part of the province as still operating within Illyricum. Sasel-Kos concludes from this that the final split came under Vespasian, who reigned from 69 to 79 AD.

• 4. Romanization and Its Limits

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  German historian Theodor Mommsen, writing in his work The Provinces of the Roman Empire, judged that coastal Dalmatia and its islands were fully romanized and Latin-speaking by the fourth century. That confident picture, however, covers only part of the truth.

  Croatian historian Aleksandar Stipcevic examined the archaeological record from the same period and found the process far more selective. Urban centers, whether coastal or inland, had absorbed Roman culture deeply. The countryside told a different story. The Illyrian population there continued to speak their own language, honor their own gods, and maintain their own social and political structures. Those structures bent toward Roman administration only where absolutely necessary.

  The contrast between town and country across Dalmatia meant that romanization was a surface of the province rather than its whole body. The governor who set out from Salona to tour the interior would have moved from a world of Latin inscriptions and forum architecture into villages where the old ways persisted with surprising durability.

• 5. Collapse and Independence

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  In 454, a military commander named Marcellinus rebelled against Valentinian III, the Roman emperor in the West. Marcellinus seized Dalmatia outright and governed it as an independent territory until he died in 468. His death opened the door for Julius Nepos, who became governor even though he was a relative of Leo I the Thracian, the emperor in the East, while Dalmatia technically remained under the western empire. The province had become, in practice, its own autonomous corner of a fracturing world.

  Leo I moved Nepos to a higher stage in 474 by elevating him as emperor of the western part of the empire, specifically to remove Glycerius, who had seized the throne as a usurper. Nepos succeeded in deposing Glycerius but was himself deposed the following year, in 475, by Orestes, who then installed his own son Romulus Augustus as western emperor. Leo I refused to recognize Romulus Augustus and continued to regard Nepos as the legitimate ruler of the west.

  Romulus Augustus was deposed in 476 by Odoacer, who proclaimed himself king of Italy. Nepos withdrew to Dalmatia and kept governing it until he was assassinated in 480. A commander named Ovida then took charge, but his tenure was brief. Odoacer used the murder of Nepos as justification to invade, defeated Ovida, and brought Dalmatia into his kingdom of Italy.

  The final transfer came in 488, when Zeno, emperor of the east, dispatched Theodoric the Great, king of the Ostrogoths, to Italy to remove Odoacer. Zeno's motives were layered: he wanted Odoacer gone, but he was also eager to relocate the Ostrogoths, who had settled in the eastern part of the empire as Roman allies and were growing restless. Theodoric fought for four years, killed Odoacer, settled his people across Italy, and established the Ostrogothic Kingdom. Dalmatia, along with the rest of the former diocese of Pannonia, passed under Ostrogothic rule.

• 6. Governors and Administration

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  The list of governors of Dalmatia stretches across more than two centuries of Roman administration. Gaius Vibius Postumus, identified by Velleius Paterculus as commander in 9 or 10 AD, is regarded as the first governor. Before him, Publius Silius held command somewhere between 19 and 16 BC, during the period when the province still carried the name Illyricum.

  Among those who governed in the first and second centuries, Publius Cornelius Dolabella served from 14 to 20 AD and Lucius Volusius Saturninus from 20 to 37 AD. The historian Cassius Dio, recorded in the list as Lucius Cassius Dio Cocceianus, governed the province around 223 to 225 AD before compiling his famous history of Rome.

  The administrative structure of the province changed significantly under Diocletian, who doubled the number of provinces across the empire while shrinking their individual size. Diocletian also grouped provinces into dioceses. Dalmatia was placed within the diocese of Pannonia, one of seven provinces in that grouping. When Constantine the Great died in 337, the empire was partitioned among his sons into three great praetorian prefectures. Dalmatia fell initially within the prefecture of Italy, Africa and Illyricum. Around 343 to 347, during the reign of Constans, the dioceses of Macedonia, Dacia and Pannonia were reorganized into a separate prefecture, reshaping Dalmatia's administrative position once more. The two independent rulers of the fifth century, Marcellinus from 454 to 468 and Julius Nepos from 468 to 480, represent the province's final phase before Odoacer's annexation ended Roman administration for good.