The site and its setting
Alexandria stands on the Mediterranean coast west of the Nile Delta, on a limestone ridge between the sea and Lake Mareotis — a position with a sea harbour on one side and access to Nile shipping on the other, which is the whole reason for the site.
The offshore island of Pharos was joined to the mainland by the Heptastadion, a causeway seven stades long that created two harbours. Silting around it eventually produced the isthmus on which much of the later city stands.
Foundation
Founded by Alexander in 331 BCE, who laid out the plan himself and marked the streets with barley meal when chalk ran out.
The foundation by Alexander is not doubted. The barley-meal story is a good anecdote in Plutarch and Arrian and is the kind of detail that accretes to a founder. A native settlement, Rhakotis, is reported to have preceded it on the site.
History of the settlement
Under the Ptolemies the city became the capital of Egypt and the intellectual centre of the Greek world, deliberately so: the Mouseion and the Library were royal institutions supporting scholars at state expense.
It passed to Rome after Actium and remained the second city of the empire and the source of a large part of Rome's grain. It was a centre of Jewish, Greek and Egyptian populations whose frictions produced serious violence more than once.
The city declined through late antiquity with earthquakes, subsidence and conquest, and the ancient street level now lies several metres down or under water.
Urban plan
Alexandria was laid out on a grid, attributed in the tradition to the architect Dinocrates, with a very wide main avenue, the Canopic Way, running east to west. The regularity contrasts sharply with Athens and Rome and is characteristic of Hellenistic foundations.
The royal quarter, the Brucheion, occupied the north-east near the harbour and contained the palaces, the Mouseion and the Library. The Serapeum stood on higher ground to the south-west.
Very little of this can be seen. The modern city sits directly on top, subsidence has dropped parts of the ancient shoreline below sea level, and the royal quarter is largely underwater.
Economy and supply
Grain above all. Egypt fed Rome, and Alexandria was the port through which it moved; the grain fleet's arrival was a political event in Rome.
The city also handled the trade of the Red Sea and beyond — spices, incense, textiles and Indian goods reaching the Mediterranean through the Egyptian desert routes — and manufactured papyrus, glass and textiles.
Cult and sanctuaries
The Serapeum housed the cult of Serapis, a deity promoted under the early Ptolemies combining Egyptian and Greek elements, which functioned as a common cult for a mixed population.
Egyptian, Greek and later Christian religious life coexisted and competed. The Serapeum was destroyed in 391 CE under Theophilus, an event that is well attested and is often confused in popular accounts with the destruction of the Library.
The city at war
Caesar was besieged in the palace quarter in 48–47 BCE, and fire in the harbour during that fighting is one of the several reported causes of loss to the Library's holdings.
The city's walls and its harbour chain protected a population that was periodically in violent internal conflict; Roman authorities intervened repeatedly.
Population
Ancient population figures are quoted with a confidence the evidence never supported. Each estimate below carries what it rests on and what it is worth.
The Ptolemaic city
300,000 free inhabitants
Diodorus Siculus 17.52, writing in the 1st century BCE
A single ancient figure, and the source of nearly every population claim about Alexandria for two thousand years. It excludes the enslaved explicitly, which means any total requires an assumption about their number. Modern estimates commonly reach half a million or more; none is independently supported.
Monuments
- Evidence level: Documented
Built under Ptolemy I and II, completed c. 280 BCE
The Pharos lighthouse
Attributed to Sostratus of Cnidus, counted among the Seven Wonders. It stood into the medieval period and was brought down by earthquakes; blocks identified as belonging to it have been recovered from the harbour floor.
- Evidence level: Documented
Founded under the early Ptolemies
The Mouseion and the Library
A royal research institution with a library attached. Its existence, its royal funding and the scholars who worked there are well attested; its building has never been located.
- Evidence level: Documented
Ptolemaic, rebuilt under Rome
The Serapeum
Partly excavated. Pompey's Pillar, a monolithic column erected in 298 CE, stands on the site and is misnamed — it has nothing to do with Pompey.
- Evidence level: Probable
Ptolemaic
The Heptastadion
The causeway to Pharos, now buried under the isthmus formed by silting around it.
- Evidence level: Documented
2nd century CE
Kom el-Shoqafa catacombs
Rock-cut tombs mixing Egyptian, Greek and Roman decoration in the same chambers — the clearest surviving statement of the city's cultural mixture.
Archaeology and excavation
Land excavation is severely constrained by the modern city and can proceed only in small rescue operations. The transformative work has been underwater: from the 1990s, surveys in the Eastern Harbour and off Abu Qir by Franck Goddio, Jean-Yves Empereur and others have mapped submerged structures and recovered colossal statuary, sphinxes and architectural blocks, including material attributed to the Pharos.
Alexandria is the clearest case on this platform of a city whose importance is inversely proportional to what can be dug. Almost every famous structure is known from texts and not from excavation, and confident reconstructions of the Library or the Pharos are drawings, not archaeology.
Museum collections
Where the finds are now. Where a holding is contested, the entry says so.
Graeco-Roman Museum · Alexandria, Egypt
Sculpture, coins and material from the city and its region.
Bibliotheca Alexandrina Antiquities Museum · Alexandria, Egypt
Including finds recovered from the underwater surveys of the harbour.
Egyptian Museum · Cairo, Egypt
Material from Alexandria within the national collection.
Open questions
What happened to the Library?
There is no single destruction to explain. Ancient and later sources variously blame the fire during Caesar's siege in 48 BCE, damage under Aurelian in the third century CE, the destruction of the Serapeum in 391 CE, and the Arab conquest of 642 CE — the last resting on a source written six centuries after the event and widely rejected. The likeliest account is not a catastrophe but attrition: loss of royal funding, papyrus decay, and the gradual dispersal of scholars. The single-great-burning story is a construction.
Where was the Library?
Not located. It was probably not a separate building but part of the palace complex attached to the Mouseion, and that quarter is largely submerged or under the modern city.
Primary sources
Strabo, Geography 17.1.6-10
The fullest ancient description of the city's plan, harbours and quarters, by a visitor.
Diodorus Siculus, Library of History 17.52
The foundation and the population figure.
Arrian, Anabasis of Alexander 3.1-2
The foundation.
How to read the evidence labels
- Evidence level: Documented
- Supported by a named primary text or by excavated material evidence.
- Evidence level: Probable
- Supported by strong inference that most specialists accept.
- Evidence level: Disputed
- Substantial specialist disagreement exists; competing readings are stated.
- Evidence level: Literary
- Belongs to poetic or mythological construction rather than to history.
- Evidence level: Mythological
- Belongs to shared religious or mythic tradition rather than to any single text.
- Evidence level: Unknown
- The available evidence is insufficient to decide.
These labels describe the status of the evidence, not our confidence in a conclusion. A claim marked Literary is not a claim we doubt; it is a claim about what kind of thing a poem is.