Many years ago on a school trip to Portsmouth harbour we were told by our history teacher that Portchester Castle, Portus Adurni, was evidence of the Anglo-Saxon invasion. Yes, built in the late 3rd century these Roman forts along the south-east corner of Britain were established to deal with Saxons that were settling on the shoreline; that’s why they are called the Saxon Shore forts he stressed. Later, in the early 5th century when the Romans left Britain, he added, the Saxons were left unchecked and run amok across the country, as recorded by the 6th century historian Gildas, to create the Anglo-Saxon kingdoms, as recorded by Bede.
I have always found the concept of a mass Anglo-Saxon invasion a rather extreme theory; yes there were Germanic settlers in Britain but I’ve always considered it more of a cultural change rather than large scale population displacement. However, I believe it is still taught as such in school today. You could interpret my old history teacher as being correct really in meaning that when the Saxons first arrived in Britain it was the beginning of the event. As far he was concerned their arrival was associated with the Saxon Shore, hence the name.
The Roman Shore Forts of Roman Britain
The term ‘Saxon Shore’ first appears in the Notitia Dignitatum, a Latin document dated AD 395, revised around AD 420, and lists just nine forts on the British coast under the command of the Count of The Saxon Shore. The majority of the forts were constructed in the late 3rd century, some earlier in first half of that century. Several of the fortifications on the east coast have suffered badly from coastal erosion and stone robbing leaving little of the original stonework remaining; in the case of Brancaster, in Norfolk, the presence of the fort can now only be detected by landscape features where the walls once stood and at Walton Castle, Suffolk, the site is now completely submerged under the North Sea.
The Saxon Shore forts today:
Brancaster (Branodunum)
This Roman fort was constructed to guard the southern point of The Wash. Today the site is just a field, the east ditch can be seen as a marked depression, the fort is often revealed by parched summer grass using aerial photograph over its buried ramparts, revealing the positions of gates and traces of internal buildings. The fort was rectangular with rounded corners, the classic ‘playing card’ shape typical of early Roman forts in Britain, and had walls 2.7 metres thick. Robbed facing stones from the Brancaster Shore Fort were re-used (together with other later material) in the south chancel of the church of St Mary the Virgin at Brancaster. It is likely there was another fortification on the northern side of The Wash near Skegness.
Burgh Castle (Gariannonum?)
Situated on a low hill above the river Waveney, the remains of Burgh Castle are now some distance inland. In Roman times the fort would have been on the shoreline of a large sheltered inlet guarding the “Great Estuary”, the site of Great Yarmouth was then sea.
The walls, 3.5 metres thick and in places still 4.5 metres high, enclosed a 2.4 hectare site. The walls with six projecting towers or bastions, possibly added later to the original design, remain on three sides. A fallen bastion can be seen on the south wall, and on the east wall a vertical break between the bastion and the adjacent section of perimeter wall shows they were built as separate components, perhaps a later addition, the bastion is only bonded to the wall at the very uppermost courses.
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| Burgh Castle |
Much of the stonework from Burgh castle has been re-used in later local buildings. The round bell tower of the church of St Peter and St Paul, Burgh Castle, displays Roman masonry such as flint, brick and tile that has been robbed from the nearby Shore fort.
At nearby Reedham the church of St John the Baptist displays large quantities of Roman building material, principally brick and tile. This, and other finds in the locality, provide evidence that a substantial Roman site once stood here. Situated on the shores of the Great Estuary it was probably a lighthouse or watchtower serving the local Shore forts.
Bradwell (Othona?)
Situated on the Dengie Marshes, Othona was located to control the estuaries of the Blackwater and Colne which provided access to the Roman city of Camulodonum (Colchester). Little has survived of the Roman fort into modern times: sections of three walls, one with a bastion, survived until the 18th century when they were demolished. The eastern wall has never been located.
The 7th-century chapel of St Peter-on-the-Wall at Bradwell-on-Sea stands on the site of the Roman fort’s west gate. Evidently much of the stonework of the fort was robbed in the Saxon period; the north wall of the chapel shows evidence of re-used Roman masonry. Limestone blocks of 'Clipsham Pink Stone' used in the Shore fort and recycled at St Peter's chapel were imported over 300km (190 miles) from quarries to the north-west of the Roman town of Durobrivae (Water Newton, Cambridgeshire).
Reculver (Regulbium)
Guarding the northern end of the now lost Wantsum Channel, a seaway that separated the Isle of Thanet from mainland Kent, stands the Roman Shore fort of Reculver. About half of the site has been lost to the sea yet substantial parts of the walls and the impressive south gate still survive. The fort had an almost square plan with rounded corners.
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| The Twin Towers of Reculver |
The east wall of the fort at Reculver displays clear evidence of later stone robbing, the entire facing stones have been removed leaving just the core rubble constructed from beach flints exposed. At the site of the south gate are three large blocks which once formed the base of a monumental arch. The medieval church of St Mary at Reculver, a landmark to mariners known as the “Twin Towers Reculver” originally sited at the centre of the Shore fort, now stands within a few metres of the coast owing to coastal erosion. The Shore fort was originally 1km from the coast.
Richborough (Rutupiae)
One of the most impressive remains of a Shore fort can be seen at Richborough where the wall circuit survives on three sides and massive ditches crossed by the line of Watling Street provides a glimpse into the days of Roman Britain. The west wall remains are 7m high, but its opposite, the east wall, has fallen into the river Stour.
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| Richborough |
The fort at Richborough was the second of a pair guarding the Wantsum Channel as Reculver stood at the northern end Richborough at the southern end. Richborough has been identified by historians as the place where the Roman invasion force landed in AD 43. The fort developed from an early military camp into a port before later fortifications were added during the 3rd century.
The north wall was built in two parts, possibly by two different units, as the break in the sections of construction can clearly be seen. Much re-used stone from earlier Roman buildings was employed in this portion of the defences when the site was refortified in the late 3rd century. The monumental blocks of the foundations of the west gate were recycled from an earlier structure on the site, probably the first century monumental arch. The so-called ‘Great Monument’, the only Roman building in Britain to have been covered externally in marble, was replaced by a watchtower, surrounded by triple ditches during this later rebuild.
Dover (Dubris)
The Romans constructed a fort at the mouth of the river Dour, then a wider estuary, for the classis Britannica, a fleet based in the English Channel, its inception probably for the invasion of Britain in AD 43. Archaeological evidence for the presence of the fleet relies mainly on tiles stamped ‘CLBR’ found on the east Kent coast and London. The fleet is not heard of after the mid-3rd century, probably disbanded and located at smaller coastal forts on either side of the channel. The classis Britannica fort at Dover was abandoned around AD 225 and a new fort was built in the late 3rd century.
The Shore fort at Dover was built over the north-east corner of the foundations of the classis Britannica port, which in turn had been built over an earlier unfinished fort. Exposed sections of the Shore fort include part of the south wall with tower. The lighthouse, known as the ‘pharos’, now stands within the medieval castle to the west of the church of St Mary in Castro. The first three quarters of its height is Roman masonry, the top quarter being a later repair, now 19m high but thought to have originally been 24m tall. The pharos is one of a pair, the other stood on the western side of the Dour estuary, known as the Western Heights, now all but lost among the Napoleonic fortification.
Lympne (Lemanis)
The Shore fort was positioned on the slopes of an ancient degraded sea cliff, originally overlooking a wide natural harbour, now Romney Marsh in Kent. The fort may have occupied the site of an earlier fort of the classis Britannica, Portus Lemanis, as mentioned in the Antonine Itinerary
Today the tumbled ruins lie scattered on the hillside owing to slumping of the clay slope on which is was built. It appears the fort was built in the shape of an irregular pentagon but landslips have broken and moved huge chunks of the walls down the slope so that its original form is no longer obvious. Several sections of wall survive, up to 6 metres tall, but mostly leaning and displaced. Eight semicircular bastions have been detected, probably of a total fourteen, the remains of one on the north wall provides a rare instance where the facing stones and brick still remains in situ. The site appears to have been abandoned around AD 350.
Pevensey (Anderida)
Pevensey is the largest and one of the most impressive of the Shore forts. The walls form an irregular oval shape, enclosing 4 hectares with a later Norman castle added to the south-east corner. The fort is now 1km from the sea but when it was built it sat at the end of raised tongue of land surrounded by coastal marsh.
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| Pevensey Castle |
Its projecting D-shaped towers were a feature of this style of Roman military architecture that appeared in the late 3rd century. The 3.6m thick walls were used later to define the outer bailey of the Norman castle. The lower portion of the bastion on the north wall at Pevensey is clearly of Roman construction, however, the part of this tower that projects above the perimeter wall is almost certainly a post-Roman addition.
Portchester (Portus Adurni)
Perhaps the finest example of all the Shore forts is at Portchester, at the head of Portsmouth Harbour, Hampshire, with, it is said, the best-preserved Roman fort walls north of the Alps. Unlike most of the Saxon Shore forts in Britain the coastal setting at Portchester is little changed from the time of its construction in the late 3rd century with the sea licking the fort on the east side as it did in Roman times.
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| Portchester |
The 3.1m thick and 6m circuit walls enclosing a regular square plan is complete except where they were altered in the 12th century by the addition of the Norman keep and medieval gatehouse in the north-western corner. A church now sits in the south-east sector. Fourteen of the original twenty projecting D-shaped bastions of the Roman fort survive. The bastions are hollow unlike those at Lympne and Pevensey. The walls were laid on a timber and flint raft, the timbers cross-braced as at Pevensey.
Occupation continued beyond the end of the Roman period, with three main phases during the late 3rd and early 4th centuries, with noticeable breaks between these stages. Whether a civilian population took over the fort or a militia formed a continuing military presence is uncertain.
In addition to the nine forts listed in the Notitia Dignitatum (above), there are a further two Roman forts on the east coast of Britain which must have been part of these coastal defences at some time.
Caistor-on-Sea
A second fort guarded the Great Estuary, along side Burgh Castle but omitted from the Notitia Dignitatum, although its defences are of similar construction to other Saxon Shore forts. This raises the question of whether Burgh Castle or Caistor was the ‘Gariannonum’ listed in the Notitia Dignitatum? The estuary has greatly silted up since Roman times and much of the fort is covered by modern housing, but a short section of the south wall and south gate can still be seen.
The forts at Burgh Castle and Caister may have formed a pair, or Burgh may have superseded Caister. Individually or as a pair, they certainly guarded a large estuary of several rivers, to prevent undesirables from penetrating inland to the heart of Roman Britain.
Walton Castle
The Roman fort at Walton Castle, near Felixstowe, Suffolk, is now totally lost to the sea through coastal erosion in the 18th century, but we know of its existence from antiquarian accounts. The wall of the fort at Walton Castle shown on an 18th-century copy of a drawing originally made in 1623 displays a clear similarity to Burgh Castle with circular bastions and rounded corners which suggests a construction date similar to Burgh Castle and Bradwell. It fills a strategic gap in the coastal defences on the east coast, in Roman times commanding the entrance to the estuary of the Stour and Orwell. The fort at Walton Castle has sometimes been identified with Portus Adurni (Portchester) or Othona (Bradwell).
These eleven forts on the east and south-east coasts of Britain have much in common and certainly formed a defensive chain in it’s entirety. They were all located on low-lying ground, close to sheltered anchorages at major estuaries and inlets. Some seem to have functioned as pairs, such as Reculver and Richborough at opposite ends of an important waterway, and Caister and Burgh Castle on opposite sides of a large estuary.
But guarding the coast from what? Debate remains over the correct interpretation of the term ‘Saxon Shore’ – did it describe the shore settled by Saxons, or the shore attacked by Saxons?
References:
Leonard Cottrell, The Roman Forts of the Saxon Shore, HMSO, 1964.
Nic Fields, Rome’s Saxon Shore, Osprey, 2006.
Valerie Maxfield (ed), The Saxon Shore: A Handbook, University of Exeter, 1989.
Andrew Pearson, The Roman Shore Forts, The History Press, 2010.
Stephen Johnson, The Roman Forts of the Saxon Shore, BCA, 1979.
D E Johnston (ed), The Saxon Shore, CBA Research Report No: 18, 1977.
Donald White, Litus Saxonicum, University of Wisconsin, 1961.
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