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ROMAN FRONTIERS, FORTIFICATIONS AND WALLS

Hadrian's Wall
Rome depended on a network of forts, walls and natural barriers to separate the empire from outsiders. Walls, military outposts and frontier cities were all types of fortifications that were employed. Seventy-three-mile-long Hadrian’s Wall’s in northern Britain is the most well-known of these fortification. The Antonine Wall, built of stone, turf and wood, was used to extend the frontier beyond Hadrian’s Wall in A.D. 142. Lambaesis was established as military fort in 81. It later served as army headquartered in North Africa. Dura-Europos was built where the Romans seized a city on a cliff above the Euphrates from Parthians in the second century A.D. [Source: Andrew Curry, National Geographic, September 2012 ]
Major barriers included Hadrian’s Wall in Britain, the Germanic Lines (walls in Germany that extended 342 miles), Limes Transalutanus (60 miles of walls in Romania) and Fossatum Africae (152 miles in Algeria.)
Diplomacy, trade and violence — and the fortifications — were all used maintain borders and keep the frontiers intact. Of the thousands of kilometers of frontier, only a small portion was protected by walls. They were mainly built to seal gaps between natural barriers such as mountains, deserts, rivers and sea. Troops were concentrated in fortresses, ultimately making the territory beyond them in the interior vulnerable. Over time, the barriers were breached and barbarian incursions led to the fall of the western part of the empire in the 5th century.
Andrew Curry wrote in National Geographic: “A stunning network of walls, rivers, desert forts, and mountain watchtowers marks Rome’s limits. At its peak in the second century A.D., the empire sent soldiers to patrol a front that stretched from the Irish Sea to the Black Sea as well as across North Africa.The question isn’t just academic. Defining and defending borders is a modern obsession too. As politicians have debated building a wall between the United States and Mexico and troops face off across the land-mine-strewn strip of ground between the two Koreas, the realities the Roman emperors faced are still with us. Understanding why the Romans were obsessed with their borders—and the role their obsession played in the decline of the empire—might help us better understand ourselves.
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Hadrian Abandons the Trajan’s Policy of Conquest
“The Upper German-Raetian Limes covers a length of 550 kilometers and runs between Rheinbrohl on the Rhine and Eining on the Danube, built in stages during the 2nd century. With its forts, fortlets, physical barriers, linked infrastructure and civilian architecture it exhibits an important interchange of human values through the development of Roman military architecture in previously largely undeveloped areas thereby giving an authentic insight into the world of antiquity of the late 1st to the mid-3rd century AD. It was not solely a military bulwark, but also defined economic and cultural limits. Although cultural influences extended across the frontier, it did represent a cultural divide between the Romanised world and the non-Romanised Germanic peoples. In large parts it was an arbitrary straight line, which did not take account of the topographical circumstances. Therefore, it is an excellent demonstration of the Roman precision in surveying. =
“The Antonine Wall was built under the Emperor Antoninus Pius in the 140’s AD as an attempt to conquer parts of northern Britain and extends for some 60 kilometers across central Scotland from the River Forth to the River Clyde. Through its military and civil constructions, it demonstrates cultural interchange through the extension of Roman technical skills, organisation and knowledge to the furthest reaches of the Empire. It embodies a high degree of expertise in the technical mastery of stone and turf defensive constructions. As it was in use for only a single generation, it provides a snapshot of the frontier at a particular point in time and offers a specific insight into how the frontier was designed and built. Together, the remains of the frontiers, consisting of vestiges of walls, ditches, earthworks, fortlets, forts, fortresses, watchtowers, roads and civilian settlements, form a social and historical unit that illustrates an ambitious and coherent system of defensive constructions perfected by engineers over the course of several generations. Each section of the property constitutes an exceptional example of a linear frontier, encompassing an extensive relict landscape which reflects the way resources were deployed in the northwestern part of the Empire and which displays the unifying character of the Roman Empire, through its common culture, but also its distinctive responses to local geography and climate, as well as political, social and economic conditions.” =
Historical Importance of the Frontiers of the Roman Empire

Hadrian dressed like a Greek god
According to UNESCO: The site is important because: “1) The extant remains of the fortified German Limes, Hadrian’s Wall and Antonine Wall constitute significant elements of the Roman Frontiers present in Europe. With their forts, fortlets, walls, ditches, linked infrastructure and civilian architecture they exhibit an important interchange of human and cultural values at the apogee of the Roman Empire, through the development of Roman military architecture, extending the technical knowledge of construction and management to the very edges of the Empire. They reflect the imposition of a complex frontier system on the existing societies of the northwestern part of the Roman Empire, introducing for the first time military installations and related civilian settlements, linked through an extensive supporting network. The frontiers did not constitute an impregnable barrier, but controlled and allowed the movement of peoples: not only the military units, but also civilians and merchants. Hence, they triggered the exchange of cultural values through movement of soldiers and civilians from different nations. This entailed profound changes and developments in the respective regions in terms of settlement patterns, architecture and landscape design and spatial organization. The frontiers still today form a conspicuous part of the landscape. [Source: UNESCO World Heritage sites website =]
2) “As parts of the Roman Empire’s general system of defense the German Limes, Hadrian’s Wall and the Antonine Wall have an extraordinarily high cultural value. They bear an exceptional testimony to the maximum extension of the power of the Roman Empire through the consolidation of its northwestern frontiers and thus constitute a physical manifestation of Roman imperial policy. They illustrate the Roman Empire’s ambition to dominate the world in order to establish its law and way of life there in a long-term perspective. They witness Roman colonization in the respective territories, the spread of Roman culture and its different traditions – military, engineering, architecture, religion management and politics – and the large number of human settlements associated with the defenses which contribute to an understanding of how soldiers and their families lived in this part of the Roman Empire. =
3) “The fortified German Limes, Hadrian’s Wall and the Antonine Wall are outstanding examples of Roman military architecture and building techniques and of their technological development, perfected by engineers over the course of several generations. They demonstrate the variety and sophistication of the Romans’ responses to the specific topography and climate as well as to the political, military and social circumstances in the northwestern part of the Empire which spread all around Europe and thereby shaped much of the subsequent development in this part of the world.” =
Hadrian ended the wave of conquest and expansion that occurred under his predecessor Trajan and enclosed the empire within clearly-defined frontiers. Hadrian did not believe that the mission of Rome was to conquer the world, but to civilize her own subjects. He therefore voluntarily gave up the extensive conquests of Trajan in the East, the provinces of Armenia, Mesopotamia, an Assyria. He declared that the Eastern policy of Trajan was a great mistake. He openly professed to cling to the policy of Augustus, which was to improve the empire rather than to enlarge it. [Source: “Outlines of Roman History” by William C. Morey, Ph.D., D.C.L. New York, American Book Company (1901) \~]
Aelius Spartianus wrote: “There were no campaigns of importance during his reign, and the wars that he did wage were brought to a close almost without arousing comment. The soldiers loved him much on account of his very great interest in the army and for his great liberality to them besides. The Parthians always regarded him as a friend because he took away the king whom Trajan had set over them. The Armenians were permitted to have their own king, whereas under Trajan they had had a governor, and the Mesopotamians were relieved of the tribute which Trajan had imposed. The Albanians and Hiberians he made his friends by lavishing gifts upon their kings, even though they had scorned to come to him. The kings of the Bactrians sent envoys to him to beg humbly for his friendship. [Source: Aelius Spartianus: Life of Hadrian,” (r. 117-138 CE.),William Stearns Davis, ed., “Readings in Ancient History: Illustrative Extracts from the Sources,” 2 Vols. (Boston: Allyn and Bacon, 1912-13), Vol. II: Rome and the West]
“And yet, at the same time, Hadrian abandoned many provinces won by Trajan, and also destroyed, contrary to the entreaties of all, the theatre which Trajan had built in the Campus Martius. These measures, unpopular enough in themselves, were still more displeasing to the public because of his pretence that all acts which he thought would be offensive had been secretly enjoined upon him by Trajan. Unable to endure the power of Attianus, his prefect and formerly his guardian, he was eager to murder him. He was restrained, however, by the knowledge that he already laboured under the odium of murdering four men of consular rank, although, as a matter of fact, he always attributed their execution to the designs of Attianus. And as he could not appoint a successor for Attianus except at the latter's request, he contrived to make him request it, and at once transferred the power to Turbo; at the same time Similis also, the other prefect, received a successor, namely Septicius Clarus.

Roman Empire in AD at the time of Augustus's death
“After Hadrian had removed from the prefecture the very men to whom he owed the imperial power, he departed for Campania, where he aided all the towns of the region by gifts and benefactions and attached all the foremost men to his train of friends. But when at Rome, he frequently attended the official functions of the praetors and consuls, appeared at the banquets of his friends, visited them twice or thrice a day when they were sick, even those who were merely knights and freedmen, cheered them by words of comfort, encouraged them by words of advice, and very often invited them to his own banquets. In short, everything that he did was in the manner of a private citizen. On his mother-in-law he bestowed especial honour by means of gladiatorial games and other ceremonies.”
Hadrian’s Defense
Andrew Curry wrote in National Geographic: “From around 500 B.C., Rome expanded continually for six centuries, transforming itself from a small Italian city-state in a rough neighborhood into the largest empire Europe would ever know. The emperor Trajan was an eager heir to this tradition of aggression. Between 101 and 117, he fought wars of conquest in present-day Romania, Armenia, Iran, and Iraq, and he brutally suppressed Jewish revolts. Roman coins commemorated his triumphs and conquests. When he died in 117, his territory stretched from the Persian Gulf to Scotland. He bequeathed the empire to his adopted son—a 41-year-old Spanish senator, self-styled poet, and amateur architect named Publius Aelius Hadrianus. [Source: Andrew Curry, National Geographic, September 2012 ]
“Faced with more territory than Rome could afford to control and under pressure from politicians and generals to follow in the footsteps of his adoptive father, the newly minted emperor—better known as Hadrian—blinked. “The first decision he made was to abandon the new provinces and cut his losses,” says biographer Anthony Birley. “Hadrian was wise to realize his predecessor had bitten off more than he could chew.” The new emperor’s policies ran up against an army accustomed to attacking and fighting on open ground. Worse, they cut at the core of Rome’s self-image. How could an empire destined to rule the world accept that some territory was out of reach?
“Hadrian may simply have recognized that Rome’s insatiable appetite was yielding diminishing returns. The most valuable provinces, like Gaul or Hadrian’s native Spain, were full of cities and farms. But some fights just weren’t worth it. “Possessing the best part of the earth and sea,” the Greek author Appian observed, the Romans have “aimed to preserve their empire by the exercise of prudence, rather than to extend their sway indefinitely over poverty-stricken and profitless tribes of barbarians.”

Roman Empire at its greatest extent in the AD 2nd century after Trajan's conquests
“The army’s respect for Hadrian helped. The former soldier adopted a military-style beard, even in official portraits, a first for a Roman emperor. He spent more than half of his 21-year reign in the provinces and visiting troops on three continents. Huge stretches of territory were evacuated, and the army dug in along new, reduced frontiers. Wherever Hadrian went, walls sprang up. “He was giving a message to expansion-minded members of the empire that there were going to be no more wars of conquest,” Birley says.
“By the time the restless emperor died in 138, a network of forts and roads originally intended to supply legions on the march had become a frontier stretching thousands of miles. “An encamped army, like a rampart, encloses the civilized world in a ring, from the settled areas of Aethiopia to the Phasis, and from the Euphrates in the interior to the great outermost island toward the west,” Greek orator Aelius Aristides noted proudly, not long after Hadrian’s death.”
Frontiers of the Roman Empire
According to UNESCO: “The ‘Roman Limes’ represents the border line of the Roman Empire at its greatest extent in the 2nd century AD. It stretched over 5,000 kilometers from the Atlantic coast of northern Britain, through Europe to the Black Sea, and from there to the Red Sea and across North Africa to the Atlantic coast. The remains of the Limes today consist of vestiges of built walls, ditches, forts, fortresses, watchtowers and civilian settlements. Certain elements of the line have been excavated, some reconstructed and a few destroyed. The two sections of the Limes in Germany cover a length of 550 kilometers from the north-west of the country to the Danube in the south-east. The 118-km-long Hadrian’s Wall (UK) was built on the orders of the Emperor Hadrian c. AD 122 at the northernmost limits of the Roman province of Britannia. It is a striking example of the organization of a military zone and illustrates the defensive techniques and geopolitical strategies of ancient Rome. The Antonine Wall, a 60-km long fortification in Scotland was started by Emperor Antonius Pius in 142 AD as a defense against the “barbarians” of the north. It constitutes the northwestern-most portion of the Roman Limes. [Source: UNESCO World Heritage sites website =]
“The Roman Empire, in its territorial extent, was one of the greatest empires history has known. Enclosing the Mediterranean world and surrounding areas, it was protected by a network of frontiers stretching from the Atlantic Coast in the west to the Black Sea in the east, from central Scotland in the north to the northern fringes of the Sahara Desert in the south. It was largely constructed in the 2nd century AD when the Empire reached its greatest extent. This frontier could be an artificial or natural barrier, protecting spaces or a whole military zone. Its remains encompass both visible and buried archaeology on, behind and beyond the frontier.”=

Roman walls and forts in northern Britain
The site “consists of three sections of the frontier: Hadrian’s Wall, the Upper German- Raetian Limes and the Antonine Wall, located in the northwestern part of the Empire, constituting the artificial boundaries of the former Roman provinces Britannia, Germania Superior and Raetia: Running 130 kilometers from the mouth of the River Tyne in the east to the Solway Firth, Hadrian’s Wall was built on the orders of the Emperor Hadrian in AD 122 as a continuous linear barrier at the then northernmost limits of the Roman province of Britannia. The frontier extended a further 36km down the Solway coast as a series of intervisible military installations. It constituted the main element in a controlled military zone across northern Britain. The Wall was supplemented by the ditch and banks of the vallum, supporting forts, marching camps and other features in a wide area to the north and south, linked by an extensive road network. It illustrates an ambitious and coherent system of defensive constructions perfected by engineers over the course of several generations and is outstanding for its construction in dressed stone and its excellent use of the spectacular upland terrain through which it passed. =
Purpose of the Walls
Andrew Curry wrote in National Geographic: “If the walls weren’t under constant threat, what were they for? Ever since British antiquarians organized the first scientific excavations along Hadrian’s Wall in the 1890s, historians and archaeologists have assumed Rome’s walls were military fortifications, designed to fend off barbarian armies and hostile invaders. [Source: Andrew Curry, National Geographic, September 2012 ]
“For decades arguments focused on tactical details: Did soldiers stand along the wall to rain spears and arrows down on invaders or sally forth to engage the enemy in the field? The trenches of WWI—and the deadly back-and-forth battling of WWII—did little to change the prevailing view of the ancient frontier as a fixed barrier separating Rome from hordes of hostile barbarians.
“Archaeologists studying the frontiers in the 1970s and ’80s later found that the Iron Curtain dividing Europe had shadowed their view of the distant past. “We had in Germany this massive border, which seemed impenetrable,” says C. Sebastian Sommer, chief archaeologist at the Bavarian State Preservation Office. “The idea was here and there, friend and foe.”
“Today a new generation of archaeologists is taking another look. The dramatic, unbroken line of Hadrian’s Wall may be a red herring, a 73-mile exception that proves an entirely different rule. In Europe the Romans took advantage of the natural barriers created by the Rhine and Danube Rivers, patrolling their waters with a strong river navy. In North Africa and the eastern provinces of Syria, Judaea, and Arabia, the desert itself created a natural frontier.
See Separate Article: ROMAN MILITARY IN BRITAIN: FRONTIERS, WALLS, FORTS, PUBS europe.factsanddetails.com

Roman Fortifications: Border Stations Rather Than Invasion Stoppers?
Andrew Curry wrote in National Geographic: “Military bases were often ad hoc installations set up to watch rivers and other key supply routes. The Latin word for frontier, limes (LEE-mess), originally meant a patrolled road or path. We still use the term: Our “limits” comes from limites, the plural of limes. [Source: Andrew Curry, National Geographic, September 2012 ] “Outposts on rivers like the Rhine and Danube or in the deserts on Rome’s eastern and southern flanks often resemble police or border patrol stations. They would have been useless against an invading army but highly effective for soldiers nabbing smugglers, chasing small groups of bandits, or perhaps collecting customs fees. The thinly manned walls in England and Germany were similar. “The lines were there for practical purposes,” says Benjamin Isaac, a historian at Tel Aviv University. “They were the equivalent of modern barbed wire—to keep individuals or small groups out.”
“Isaac argues that the frontiers resembled certain modern installations more than thick-walled medieval fortresses: “Look at what Israel’s building to wall off the West Bank. It’s not meant to keep out the Iranian army, it’s made to stop people from exploding themselves on buses in Tel Aviv.” Warding off terrorists may not have motivated the Romans, but there were plenty of other factors— as there are today. “What the United States is planning between itself and Mexico is substantial,” says Isaac, “and that’s just to keep out people who want to sweep the streets in New York.”
“More archaeologists are endorsing that view. “Isaac’s analysis has come to dominate the field,” says David Breeze, author of the recent Frontiers of Imperial Rome. “Built frontiers aren’t necessarily about stopping armies but about controlling the movement of people.” The Roman frontier, in other words, is better seen not as an impervious barrier sealing Fortress Rome off from the world but as one tool the Romans used to extend influence deep into barbaricum, their term for everything outside the empire, through trade and occasional raids.
Hadrian's Wall
Emperor Hadrain (A.D. 76-138) ordered and oversaw the building of Hadrian’s Wall near the present-day border between Scotland and England to protect the unstable British provinces from fierce tribes such as the Caledonians, Picts and "Raiding Scots" in present-day Scotland. Hadrian's Wall was a Roman frontier built between A.D. 122 and 130. Running for 117 kilometers (73 miles) between Wallsend-on-Tyne in the east to Bowness on the Solway Firth in the west, it makes use of ridges and crags, particularly Whin Sill, and offers goods view to the north. A deep ditch reinforced some parts of it. Other parts were built on the top of cliffs.
Probably largely built by Roman troops and slaves, Hadrian’s Wall is the most lasting and famous monument left behind by the Romans in Britain and remains a powerful symbol of Roman rule. Stretching from the North Sea near the east coast town of Newcastle to the Irish Sea near Carlisle in the west, the 2000-year-old wall snakes through treeless valleys and over bluffs in a land as big as the sky. The 12 best preserved miles of the wall are located in Northumberland National Park where hills gently rise and fall like waves in a calm sea.
Andrew Curry wrote in National Geographic: “That “outermost island” was where Hadrian built the monument that bears his name, a rampart of stone and turf that cut Britain in half. Today Hadrian’s Wall is one of the best preserved, well-documented sections of Rome’s frontier. Remnants of the 73-mile barrier run through salt marshes, across green sheep pastures, and for one bleak stretch not far from downtown Newcastle, alongside a four-lane highway. Miles of it are preserved aboveground, lining crags that rise high above the rain-swept countryside. [Source: Andrew Curry, National Geographic, September 2012 ]
See Separate Article: HADRIAN’S WALL europe.factsanddetails.com
Dura-Europos
Andrew Curry wrote in National Geographic: “Just as Hadrian’s Wall shows the Roman frontier at its strongest, an abandoned fortress on the Euphrates River vividly captures the moment the borders began to collapse. Dura-Europos was a fortified city on the frontier between Rome and Persia, its greatest rival. Today Dura sits about 25 miles from the Syrian border with Iraq, an eight-hour bus ride through the desert from Damascus. It first came to light in 1920, when British troops fighting Arab insurgents accidentally uncovered the painted wall of a Roman temple. A team from Yale University and the French Academy put hundreds of Bedouin tribesmen to work with shovels and picks, moving tens of thousands of tons of sand with the help of railcars and mine carts. “At times it was like the Well of Souls scene from Indiana Jones,” says University of Leicester archaeologist Simon James. [Source: Andrew Curry, National Geographic, September 2012 ]
“Ten years of frenzied digging uncovered a third-century Roman city frozen in time. Fragments of plaster still cling to mud-brick and stone walls, and the rooms of palaces and temples—including the world’s oldest known Christian church—are tall enough to walk through and imagine what they looked like when they had roofs.
“Founded by Greeks around 300 B.C., Dura was conquered by the Romans nearly 500 years later. Its tall, thick walls and perch above the Euphrates made it a perfect frontier outpost. The northern end was walled off and turned into a Roman-era “green zone” with barracks, an imposing headquarters for the garrison commander, a redbrick bathhouse big enough to wash the dust off a thousand soldiers, the empire’s easternmost known amphitheater, and a 60-room palace suitable for dignitaries “roughing it” in the hinterlands.
“Duty rosters show at least seven outposts reported to Dura. One of the outposts was staffed by just three soldiers; another lay nearly a hundred miles downstream. “This was not a city under constant threat,” James told me when I visited, before the political situation in Syria deteriorated and made excavation impossible. We sat amid the ruins and watched orange gas flares from Iraqi oil wells flicker on the horizon. “Soldiers here were probably busier policing the locals than defending against raids and attacks.”
“The quiet didn’t last. Persia emerged as a major threat along the empire’s eastern border a half century after the Romans seized Dura. Beginning in 230, war between the rivals raged across Mesopotamia. It was soon clear the frontier strategy that had served Rome for more than a century was no match for a determined, sizable foe.
“Dura’s turn came in 256. Working with a Franco-Syrian team of archaeologists interested in the site’s pre-Roman history, James has spent ten years unraveling the walled city’s final moments. He says the Romans must have known an attack was imminent. They had time to reinforce the massive western wall, burying part of the city—including the church and a magnificently decorated synagogue—to form a sloping rampart.
“The Persian army set up camp in the city cemetery, a few hundred yards from Dura’s main gate. As catapults lobbed stones at the Romans, the Persians built an assault ramp and dug beneath the city, hoping to collapse its defenses. Dura’s garrison struck back with tunnels of their own.

Dura Europos
“As fighting raged on the surface, James says, a squad of 19 Romans broke through into a Persian tunnel. A cloud of poison gas, pumped into the underground chamber, suffocated them almost instantly. Their remains are some of the oldest archaeological evidence of chemical warfare. James believes the bodies, found 1,700 years later, stacked in a tight tunnel, were used to block the tunnel while the Persians set it on fire.
“The Persians failed to topple Dura’s wall but eventually succeeded in taking the city, which was later abandoned to the desert. Surviving defenders were slain or enslaved. Persian armies pushed deep into what had been Rome’s eastern provinces, sacked dozens of cities, and overpowered two emperors before capturing a third, the hapless Valerian, in 260. The Persian king, Shapur, reportedly used Valerian as a footstool for a while, then had him flayed and nailed his skin to a wall.
“The crisis was a turning point. Around the time Dura fell, the careful balance of offense, defense, and sheer intimidation along the frontier fell apart.For nearly 150 years the border had helped Rome ignore a painful reality: The world beyond the walls was catching up, in part thanks to the Romans themselves. Barbarians who served in the Roman army brought back Roman knowledge, weapons, and military strategy, says Michael Meyer, an archaeologist at Berlin’s Free University.”
Image Sources: Wikimedia Commons
Text Sources: Internet Ancient History Sourcebook: Rome sourcebooks.fordham.edu ; Internet Ancient History Sourcebook: Late Antiquity sourcebooks.fordham.edu ; “Outlines of Roman History” by William C. Morey, Ph.D., D.C.L. New York, American Book Company (1901) ; “The Private Life of the Romans” by Harold Whetstone Johnston, Revised by Mary Johnston, Scott, Foresman and Company (1903, 1932); BBC Ancient Rome bbc.co.uk/history/ ; Project Gutenberg gutenberg.org ; Metropolitan Museum of Art, National Geographic, Smithsonian magazine, New York Times, Washington Post, Los Angeles Times, Live Science, Discover magazine, Archaeology magazine, Reuters, Associated Press, The Guardian, AFP, The New Yorker, Wikipedia, Encyclopædia Britannica, Encyclopedia.com and various other books, websites and publications.
Last updated October 2024