The Pharos of Alexandria, built under the first two Ptolemies and attributed to Sostratus of Cnidus, was counted among the Seven Wonders and stood into the medieval period before earthquakes brought it down. It is the reason several European languages use a form of its name for a lighthouse.
What is actually known is thinner than the reconstructions suggest. Descriptions come from authors writing centuries after it was built and, in the fullest cases, from Arab visitors more than a thousand years later. Depictions on coins and in mosaics are schematic. The commonly repeated three-stage form — square, octagonal, cylindrical — comes from those late descriptions.
Underwater survey in the Eastern Harbour from the 1990s has recovered very large blocks and statuary attributed to the structure, which confirms its scale and location without settling its elevation.
What the evidence supports
The Pharos existed, stood on Pharos island, and was very tall.
Attested across many independent sources, and corroborated by the recovery of colossal architectural blocks from the harbour floor.
Its detailed form is reconstructed from late descriptions.
The three-stage profile derives principally from medieval Arab accounts, a millennium after construction. Modern drawings are inferences.
Reports of a mirror visible for enormous distances are not credible.
The claim appears in late sources and describes optical performance no ancient technology could deliver. It is a good example of a wonder accumulating wonders.
Examples
The evidence level on each answers how we know what the building looked like, not whether it existed.
- Evidence level: Disputed
Alexandria · Completed c. 280 BCE
The Pharos of Alexandria
Attributed to Sostratus of Cnidus. Brought down by earthquakes; blocks attributed to it have been recovered from the harbour.
- Evidence level: Documented
A Coruña, Spain · Probably 2nd century CE
The Tower of Hercules
A Roman lighthouse still standing and still operating, though encased in an eighteenth-century restoration. Standing and still operating, though encased in an eighteenth-century restoration.
Primary sources
Strabo, Geography 17.1.6
A description of the Pharos by a visitor to Alexandria.
Pliny the Elder, Natural History 36.18
The Pharos among the wonders, with the cost and the dedication.
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.