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Portus Adurni was a Roman fort in the Roman province of Britannia situated at the north end of Portsmouth Harbour. It was part of the Saxon Shore, and is the best-preserved Roman fort north of the Alps. [1] Around an eighth of the fort has been excavated. [2]
It was later converted into a medieval castle known as Portchester Castle.
The name Portus Adurni appears only in the list of Saxon Shore forts in the 5th-century Notitia Dignitatum , and the name is usually identified with Portchester, [3] although it has occasionally been identified with the Roman fort at Walton Castle, Suffolk (which has now been washed away by the sea). [4] Portus Adurni may be identical with the Ardaoneon listed in the Ravenna Cosmography , [3] and Rivet and Smith derive both names from the British "ardu-" meaning "height". [4] This derivation fits Portchester (which lies beneath Portsdown Hill) better than a flat location such as Walton Castle. [4]
The fort was built during the 3rd century as part of the so-called Saxon Shore forts to protect the southern coastline of Britain, possibly from Saxon raiders. It occupies a commanding position at the head of Portsmouth Harbour. The fort is square, enclosing an area of 9 acres (36,000 m2) with outer walls 20 feet (6 m) high, 10 feet (3 m) thick, 210 yards (200 m) long and constructed of coursed flint bonded with limestone slabs. Square-shaped forts became widely used during the 3rd century, being highly practical and defensible. Portus Adurni has towers all along the walls, as well as towers that angle out at the corners. Historians feel this paramount concern for defensibility may reflect the seriousness of the Saxon raids during this time, or the defensive pressures of the Carausian Revolt (see below). The gates of Portus Adurni are of particular interest: they are indented inwards, so as to trap the enemy in an area exposed to walls on three sides; this technique became widely used from the Augustinian age to the fall of the Empire.
Unusually for a building of this period, most of the walls and bastions are complete. It has lost only four of its bastions. The walls themselves have been quarried to provide stone for later additions, but from the outside at least they appear much as they did when they were first erected. The walls were built in sections, by groups of gangs, which explains the different textures as you walk along the outer perimeter.
The Saxon Shore forts, including Portus Adurni, were built during the mid to late 3rd century amid increased instability in north-eastern Gaul and the Rhineland, eventually leading to the Roman evacuation of that area. The forts were intended to maintain control over the region, and monitor shipping and trade, as well as defending against raids from across the English Channel. These forts became defensive holding points for the rebel Carausius, who in 285 was given the task of solving the Saxon piracy problem in the English Channel. When Carausius was charged with keeping the pirates' booty for himself, he retreated to Britain and proclaimed himself Emperor. The revolt went on for almost 10 years while other Roman generals tried and failed to dislodge him, until he was eventually murdered by Allectus, one of his aides, in 293, and Britain was finally taken back by 296. While some of the Saxon Shore forts were built under previous commanders and emperors, some were built by Carausius during his revolt and evidence suggests that Portus Adurni was built during this time; many of the coins uncovered at the site were minted by Carausius as emperor during his revolt.
Even after the departure of the Roman Army Portus Adurni's location and strong walls made it attractive as a fortress. The fort became an Anglo-Saxon high-status residence with great hall and tower. Later the Roman gateways were rebuilt as well. Portchester is listed as one of thirty-three fortified burhs in the Burghal Hidage, believed to date from the reign of Edward the Elder, who reigned from 899 to 924 AD.
The circuit walls of the fort became the outer bailey wall of a Norman castle and later medieval palace. It was used as a gaol during the Napoleonic Wars. Its exceptional condition can therefore be attributed to the fact that, despite short periods of abandonment and longer periods of neglect, the fort was occupied for almost sixteen centuries. The site is owned by the Southwick Estate but managed by English Heritage, and is open to visitors throughout the year.
Roman Britain was the territory that became the Roman province of Britannia after the Roman conquest of Britain, consisting of a large part of the island of Great Britain. The occupation lasted from AD 43 to AD 410.
There are many Roman sites in Great Britain that are open to the public. There are also many sites that do not require special access, including Roman roads, and sites that have not been uncovered.
Portchester is a village in the borough of Fareham in Hampshire, England. It is 4 miles (6.4 km) northwest of Portsmouth and around 18 miles east of Southampton on the A27 road. Its population according to the 2011 United Kingdom census was 17,789.
Portchester Castle is a medieval fortress that was developed within the walls of the Roman Saxon Shore fort of Portus Adurni at Portchester, to the east of Fareham in Hampshire.
Roman roads in Britannia were initially designed for military use, created by the Roman army during the nearly four centuries (AD 43–410) that Britannia was a province of the Roman Empire.
Richborough Castle is a Roman Saxon Shore fort better known as Richborough Roman Fort. It is situated in Richborough near Sandwich, Kent. Substantial remains of the massive fort walls still stand to a height of several metres.
Pevensey Castle is a medieval castle and former Roman Saxon Shore fort at Pevensey in the English county of East Sussex. The site is a scheduled monument in the care of English Heritage and is open to visitors. Built around 290 AD and known to the Romans as Anderitum, the fort appears to have been the base for a fleet called the Classis Anderidaensis. The reasons for its construction are unclear; long thought to have been part of a Roman defensive system to guard the British and Gallic coasts against Saxon pirates, it has more recently been suggested that Anderitum and the other Saxon Shore forts were built by a usurper in an ultimately unsuccessful attempt to prevent Rome from reimposing its control over Britain.
Dubris, also known as Portus Dubris and Dubrae, was a port in Roman Britain on the site of present-day Dover, Kent, England.
The Classis Britannica was a provincial naval fleet of the navy of ancient Rome. Its purpose was to control the English Channel and the waters around the Roman province of Britannia. Unlike modern "fighting navies", its job was largely the logistical movement of personnel and support, and keeping open communication routes across the Channel.
This is a timeline of English history, comprising important legal and territorial changes and political events in England and its predecessor states. To read about the background to these events, see History of England.
Anderitum was a Saxon Shore fort in the Roman province of Britannia. The ruins adjoin the west end of the village of Pevensey in East Sussex, England. The fort was built in the 290s and was abandoned after it was sacked in 471. It was re-inhabited by Saxons and in the 11th century the Normans built a castle within the east end of the fort.
Cardiff Roman Fort was a coastal fort in the Roman province of Britannia Superior, of which Roman Wales was a part. Its original Latin name is uncertain. Its remains are incorporated into Cardiff Castle in the modern capital city of Wales.
The Saxon Shore was a military command of the Late Roman Empire, consisting of a series of fortifications on both sides of the Channel. It was established in the late 3rd century and was led by the "Count of the Saxon Shore". In the late 4th century, his functions were limited to Britain, while the fortifications in Gaul were established as separate commands. Several well-preserved Saxon Shore forts survive in east and south-east England.
Events from the 3rd century in Roman Britain.
Portus Lemanis, also known as Lemanae, was the Latin name of a Roman Saxon Shore fort, settlement and port in southern Kent. The modern village of Lympne derives its name from the ancient port. The site, known locally as Stutfall Castle, is on private land which is accessible by public footpath.
Othona or Othonae was the name of an ancient Roman fort of the Saxon Shore at the sea's edge near the modern village of Bradwell-on-Sea in Essex, England. The Old English name Ythanceaster for the locality derives from the Roman name.
Clausentum was a small town in the Roman province of Britannia. The site is believed to be located in Bitterne Manor, which is now a suburb of Southampton.
Walton Castle was a Saxon Shore Fort in the Roman province of Britannia. The fort was reused by the Normans who used it as the bailey for a castle. It stood 30 metres above sea level but was destroyed by coastal erosion in the 18th century. It was located in the village of Walton, Suffolk, now part of Felixstowe.
The frontier of the Roman Empire in Britain is sometimes styled Limes Britannicus by authors for the boundaries, including fortifications and defensive ramparts, that were built to protect Roman Britain. These defences existed from the 1st to the 5th centuries AD and ran through the territory of present-day England, Scotland and Wales.
Lancaster Roman Fort, also known as Wery Wall, Galacum or Calunium, is the modern name given to ruined former Roman fort atop Castle Hill in Lancaster in North West England. The first castra was founded c. 80 AD within the Roman province of Britannia.