Porolissum: the Roman frontier city on the edge of Dacia
Porolissum was a Roman military and civilian town in northern Dacia, on the hills of Moigrad-Porolissum in Sălaj County, about 8 km from Zalău. Founded as a fort in 106, it grew into the capital of the province of Dacia Porolissensis, and today its two forts, amphitheatre and rebuilt gate make it one of the best-preserved Roman sites in Romania.
Porolissum guarded the pass into Roman Dacia for about 165 years. Its garrison included Britons and archers from Palmyra, and its amphitheatre seated roughly 5,000 spectators.
The history of Porolissum
Porolissum began in 106, at the start of Emperor Trajan’s second war against the Dacians, when the Romans set up a stronghold to defend the main passage through the Carpathians. It became the defensive centre of north-western Dacia and of the Limes Porolissensis, the frontier line. The soldiers stationed here were granted Roman citizenship, and over time the garrison included units from far parts of the empire, such as a British cohort, a cohort of Lingones and units of Palmyrene archers. The name appears on the Peutinger Table and in the Geography of Ptolemy.
A civilian settlement, the vicus, spread over the terraces south and west of the fort. When Hadrian created the province of Dacia Porolissensis in 124, named after the already sizeable town, Porolissum became its administrative centre. Under Septimius Severus it received the status of municipium, which let its leaders and merchants act independently. The town was also a place of trade with the peoples beyond the frontier, and a customs station stood near the fort. The garrison seems to have lived in peace with its neighbours, and inscriptions name officials with mixed Roman and Dacian names.
Two forts defended the town. The larger, on Pomet hill, measured about 226 by 294 metres, was first built with earth ramparts and later rebuilt in stone, with repairs recorded under Caracalla and Gallienus. A smaller fort, about 67 by 101 metres, lay 700 metres to the north-east on Citera hill. Outside the town stood an amphitheatre, built in wood in Hadrian’s time and rebuilt in stone in 157, with room for 5,000 to 5,500 spectators. Nearby was a sanctuary of Nemesis, goddess of fortune and justice, worshipped by soldiers and gladiators. Excavations have also found public baths, a customs house and a temple of Liber Pater.
The Romans withdrew from Dacia around 271 under Aurelian, but the site was not emptied at once: it seems to have been inhabited sporadically until the late 4th century, and early medieval tombs have been found. Limited digging began in the 19th century, and large-scale systematic excavation started in 1977. Romanian, American, German and Hungarian teams have worked here, and a stone sarcophagus came to light in 2015. In 2024 Porolissum was inscribed on the UNESCO World Heritage List as part of the Dacian Limes, together with 277 other components of the frontier system.
Curiosities about Porolissum
- The name Porolissum is recorded on the Peutinger Table, a Roman road map copied in the Middle Ages, and in the Geography of the ancient scholar Ptolemy.
- The Romanian Wikipedia article says the soldiers came from Spain, Gaul and Britain, a reminder that Rome staffed this far corner of the empire with troops from all over it.
- The Porolissum amphitheatre, with 5,000 to 5,500 seats, was first built of wood under Hadrian and rebuilt in stone in 157.
- Nemesis, goddess of justice and destiny, had a sanctuary beside the amphitheatre, because soldiers and gladiators who faced danger prayed to her.
- The rebuilt Porta Praetoria is the symbol of the site, but current research suggests the real gate stood one storey higher than the reconstruction.
- Porolissum is the main setting of Harry Turtledove’s alternate-history novel Gunpowder Empire, in which it appears as the city of Polisso.
Tours near Porolissum
Experiences in the area that you can book online with Viator:
Visiting Porolissum: what to see
- The reconstructed Porta Praetoria, the main gate of the stone fort on Pomet hill, is the easiest landmark to recognise.
- Walk the outline of the large fort and its principia, then look across to the smaller fort on Citera hill. The hilltop gives a wide view over the Meseș Mountains.
- The amphitheatre and the remains of the civilian town lie outside the fort walls, where excavations have continued for years, so some areas may be fenced off.
- Many finds are kept away from the site, in Cluj-Napoca and in the county museum in Zalău.
- Șimleu Silvaniei Fort, about 33 km away, is the nearest other place of interest on this site. Check the current opening hours before you go.
Opening hours, access and conditions can change. Check before you go.
Map: where Porolissum is
Map: © OpenStreetMap contributors
Photos of Porolissum
Questions
Where is Porolissum?
It lies on the hills at Moigrad-Porolissum, in Mirșid commune, Sălaj County, about 8 km from the town of Zalău in north-western Romania.
What was Porolissum?
It was a Roman military fort and civilian city on the northern frontier of Dacia, and from 124 the capital of the province of Dacia Porolissensis.
What can you see at Porolissum?
Visitors can see two Roman forts, the rebuilt main gate, an amphitheatre, the remains of baths and a customs house, and a sanctuary of Nemesis.
When was Porolissum founded?
The Romans founded it in 106 as a military stronghold during Trajan’s Dacian wars. It became a provincial capital in 124 and a municipium under Septimius Severus.
Is Porolissum a UNESCO site?
Yes. In 2024 it was inscribed on the World Heritage List as part of the Dacian Limes, a group of 277 components of the Roman frontier.
What happened to Porolissum after the Romans left?
The Romans withdrew from Dacia around 271, but the site seems to have been lived in sporadically until the late 4th century.
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