The Fortress of Babylon: the Roman Roots of Cairo
The Fortress of Babylon, whose imposing remains still dominate today the Coptic quarter of Cairo, is one of the most ancient and significant monuments of the Egyptian capital. Originally built in the 1st century BC during the Roman domination of Egypt, this military fortress controlled a crucial strategic point along the Nile, protecting the fluvial route that connected the Delta with Upper Egypt and guarding the commercial routes that crossed the region. Its massive walls and imposing towers are the physical and symbolic foundations on which the Christian quarter of Cairo arose, and some of the most ancient churches of the world are literally built on top of its structures.
The name "Babylon" applied to an Egyptian site has generated great curiosity among historians and visitors. The theories on the origin of this name are multiple and fascinating: according to a tradition reported by the Greek historian Diodorus Siculus, a group of Babylonian prisoners deported to Egypt by the pharaoh Sesostris founded a settlement in this place, giving it the name of their native city. Another hypothesis would connect the name to the ancient Egyptian word "Per-Hapi-en-Iunu" (the dwelling of the Nile of Heliopolis), which the Greeks and the Romans would have corrupted into "Babylon".
History of the Fortress
The Persian and Ptolemaic Origins
The origins of the settlement in this place precede the Roman presence. Already during the Persian domination of Egypt (525-332 BC), there probably existed some form of military garrison in this strategic position, where the Nile formed a bend that permitted the easy crossing of the river. During the Ptolemaic period (305-30 BC), the settlement developed further, but it was with the Romans that the fortress assumed the dimensions and the form that still today are in part recognisable.
The Roman Construction
The fortress proper was built during the Augustan period, after the Roman conquest of Egypt in 30 BC. Its function was multiple: to control the fluvial traffic on the Nile, to protect the commercial routes towards the Red Sea, to guard the access to the Delta and to host the Roman military garrison in the region. The position was ideal: the site was found at the point where the canal that connected the Nile to the Red Sea (the precursor of the Suez Canal) entered the river, conferring on the fortress a strategic and commercial importance of the first rank.
The Restorations of Trajan
A fundamental intervention in the history of the fortress was the restructuring willed by the emperor Trajan at the beginning of the 2nd century AD. Trajan, known for his programme of great public works throughout the empire, had the defences of the fortress enlarged and strengthened, adding the powerful circular towers that are today the most visible and best preserved elements of the complex. The Trajanic towers, built in red bricks alternated with bands of limestone, reached a considerable height and permitted controlling visually a wide portion of the course of the Nile.
The restorations of Trajan also included the renewal of the surrounding walls, the construction of new monumental gates and the enlargement of the lodgings for the garrison. The fortress thus became one of the principal Roman military installations in Egypt, comparable in importance only to the fortress of Alexandria.
The Late-Roman and Byzantine Period
With the decline of the Western Roman Empire and the shift of the centre of power towards Byzantium, the Fortress of Babylon maintained its strategic importance. In the 4th-5th century, with the diffusion of Christianity in Egypt, the area within and around the fortress became the nucleus of the Christian community that would give life to the Coptic quarter. The Roman military structures were gradually adapted to civil and religious uses: the towers became foundations of churches, the warehouses were converted into places of worship and the walls offered protection to the growing community of faithful.
The Arab Conquest
In 641 AD, the Arab troops guided by the general Amr ibn al-As laid siege to the Fortress of Babylon, which at the time was the principal Byzantine bulwark in Egypt. The siege lasted about seven months and concluded with the surrender of the Byzantine garrison in 642 AD. The fall of the fortress marked the Arab conquest of Egypt and the beginning of a new era for the country.
After the conquest, Amr ibn al-As founded his military camp (al-Fustat) in the immediate vicinity of the fortress, giving origin to what would become the nucleus of the city of Cairo. The first mosque of Africa, the Mosque of Amr ibn al-As, was built right next to the fortress, marking symbolically the passage from Byzantine Christian Egypt to Islamic Egypt.
Architectural Structure
The Circular Towers
The most impressive and best preserved elements of the fortress are the two great circular towers of the southern gate, which today support the Hanging Church. These towers, of about 30 metres diameter each, are built with the Roman masonry technique of the opus mixtum, alternating courses of red bricks with bands of limestone ashlars. The solidity of these structures is surprising: after almost two thousand years, the towers still support the weight of an entire church and of the visitors who frequent it.
Other towers, smaller and less well preserved, are visible along the perimeter of the fortress, in particular in the area of the Coptic Museum, where the archaeological excavations have brought back to light significant stretches of the surrounding walls. These minor towers were distributed at regular intervals along the walls and served as observation and defence posts.
The Surrounding Walls
The original perimeter of the fortress is estimated at about 400 x 200 metres, a considerable area that today is almost entirely occupied by the Coptic quarter. The walls, several metres thick, were built on foundations in limestone blocks and rose for a height that the historians estimate at about 18 metres, with patrol walkways on the summit. Significant stretches of the walls are visible in the garden of the Coptic Museum, along the foundations of the Hanging Church and in various scattered points in the quarter.
The Gates and the Accesses
The fortress had at least two principal gates: the southern gate, above which the Hanging Church rises, and a northern gate of which remain less evident traces. The gates were equipped with guard towers and defensive systems that rendered the fortress practically impregnable for the standards of the epoch.
The Archaeological Strata
A Palimpsest of Civilisations
The Fortress of Babylon is a formidable archaeological palimpsest, where the remains of various epochs and civilisations are superimposed and interweave in a stratified account of Egyptian history. Descending from the current level of the soil, the archaeologists have identified Roman, Byzantine, Coptic and Islamic strata, each with its own characteristic artefacts, construction techniques and traces of daily life.
The excavations conducted in the 20th and 21st century have brought back to light Roman and Byzantine ceramics, coins, fragments of Latin and Greek inscriptions, remains of mosaic floors and hydraulic structures that testify to the sophistication of the Roman settlement. On these are superimposed Coptic strata with fragments of ecclesiastical decorations, oil lamps with Christian symbols and utilitarian ceramics, followed by Islamic levels with their glazed ceramics and their characteristic artefacts.
The Role of the Nile
A fundamental aspect for understanding the history of the fortress is the relationship with the Nile. At the moment of its construction, the river flowed much closer to the fortress than it does today, and the southern towers overlooked almost directly the water. Over the course of the centuries, the progressive shift of the course of the Nile towards the west and the accumulation of alluvial deposits have gradually moved the river away from the fortress, radically changing the geography of the place.
This process has also had the effect of progressively raising the level of the surrounding terrain, partially "burying" the structures of the fortress and reducing the visible height of the towers and the walls. The archaeological excavations have permitted bringing back to light several metres of structures originally underground, restoring a more complete vision of the original grandeur of the fortress.
The Fortress Today
The Visit Route
Today the remains of the Fortress of Babylon are integrated into the visit route of the Coptic quarter and are visible in various points. The towers of the southern gate, under the Hanging Church, are the most spectacular element: through glass panels in the floor of the church, the visitors can observe the underlying Roman structures. In the garden of the Coptic Museum, stretches of the walls and the towers are exposed in the open and accessible up close. Other remains are visible along the pedestrian routes of the quarter.
The Excavation Campaigns
The most recent excavation campaigns, conducted by international teams in collaboration with the Egyptian authorities, have enormously enriched the knowledge of the fortress. Non-invasive investigation techniques, such as the georadar and the magnetometry, have permitted mapping the structures still buried without excavating, revealing the complete extension of the perimeter of the walls and identifying possible internal structures still to be explored.
Tips for the Visit
How to Arrive
The remains of the Fortress of Babylon are found within the Coptic quarter of Cairo, reachable with the metro (Mar Girgis stop, Line 1). The quarter is accessible on foot from the exit of the metro in about 5 minutes.
What to Observe
The best points to observe the remains of the fortress are: the glass floor of the Hanging Church, which reveals the underlying towers; the garden of the Coptic Museum, where stretches of the walls are visible in the open; and the archaeological area at the southern gate, where the excavations have exposed various strata of superimposed history. Pay attention to the Roman construction technique with the alternation of red bricks and limestone, a characteristic that permits distinguishing immediately the Roman structures from those of a subsequent epoch.
Practical Suggestions
The visit to the fortress is naturally integrated into the exploration of the Coptic quarter and does not require a separate ticket (except for the entrance to the Coptic Museum and to the Hanging Church). To understand fully the history and the importance of the fortress, it is advisable to begin the visit from the Coptic Museum, where explanatory panels and reconstructive models offer an overall vision of the original structure. A local guide can help to identify the remains of the fortress in the less evident points and to contextualise them in the wider history of Roman and Christian Egypt.
Combining the Visit
The Fortress of Babylon is visited naturally as part of the exploration of the Coptic quarter, together with the Hanging Church, the Church of Saint Sergius and Bacchus, the Ben Ezra Synagogue and the Coptic Museum. For an itinerary that embraces the entire history of ancient Cairo, consider including also the nearby Mosque of Amr ibn al-As, which rises right next to the fortress and marks the passage from Christian Egypt to Islamic Egypt.
