Antirhodos Island – Cleopatra's Sunken Palace Island
Antirrhodus · Island of Antirhodos · Cleopatra's Island
Ptolemaic to Late Antique (c. 300 BCE – 365 CE submerged)·Ptolemaic Greek / Roman·🇪🇬 Alexandria, Eastern Harbour (Portus Magnus), Egypt
About
About Antirhodos Island – Cleopatra's Sunken Palace Island
Small palatial island (~500×300 m) in Alexandria's Eastern (Great) Harbour enclosing the royal palace quarter (Brucheion). Built by Ptolemies as extension of Heptastadion mole royal complex; site of Cleopatra VII's palace, Caesareum forecourt, Timonium of Antony. 8) and Seneca describe Antirhodos harbour. Cataclysm: 4th c. earthquake tsunami (AD 365 Crete quake) + liquefaction dropped island 6–8 m; now 5–8 m down. Franck Goddio 1996– excavated granodiorite sphinx of Ptolemy XII (Cleopatra's father), granite colossi, shipwreck timbers, gold coins, palace pavements, wharfs and 7,000 architectural fragments.
Sea-level subsidence documented 4–5 m since Ptolemaic era; palaeomagnetic. UNESCO Alexandria submerged heritage flagship.
Why it mattersOnly in situ Ptolemaic palatial island; granodiorite royal statuary links epigraphy to Cleopatra lineage and quantifies harbour subsidence magnitude for Mediterranean sea-level curves.
Open questions
Mysteries & theories
Mysteries
- 01Exact attribution of palace rooms to Cleopatra VII vs Ptolemy XII extensions
- 02Whether Antirhodos artificially paved or natural islet enlarged
Theories
- 01AD 365 Crete thrust quake generated turbidite + liquefaction not later AD 741 event; Eastern Harbour subsidence multi-phase
Theories are interpretations, not findings. The seal above tells you how much scholarly weight the place carries.
History
How it came to be
- Built
- Ptolemy I–Cleopatra VII royal architects
- Period
- Ptolemaic to Late Antique (c. 300 BCE – 365 CE submerged)
- Culture
- Ptolemaic Greek / Roman
- Builders
- Ptolemaic Greek
- Purpose
- Private palatial harbour island, royal palace and Timonium, Dynastic harbour control
- Abandoned
- 365 CE Crete earthquake + liquefaction (main 365)
- Rediscovered
- Goddio IEASM 1996 Eastern Harbour geophys.; Bernard Empereur parallel
- Excavation
- Submerged
331 BCE
Alexandria foundation, Eastern Harbour mole planned
47 BCE
Antony-Cleopatra Timonium built on Antirhodos
365 CE
AD 365 Crete quake/tsunami subsides Eastern Harbour 5–6 m
1996
Goddio locates Antirhodos sphinx of Ptolemy XII at –5.5 m
On the ground
Structures & features
31.2058° N · 29.8859° E · -6 m · 3 mapped features
Antirhodos palace podium
palaceGranite-paved palatial complex with sphinx findspot
31.2058° N · 29.8859° EPtolemy XII granodiorite sphinx find
sculpture findSphinx inscribed Ptolemy XII Auletes at –5.5 m
31.2056° N · 29.8862° EHeptastadion mole causeway (reference)
causeway7-stade mole linking Pharos to city, still traceable
31.2050° N · 29.8830° E