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factbase-ancient-history/cities/alexandria.md
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Alexandria

Overview

Alexandria was founded by Alexander the Great in 331 BCE on the Mediterranean coast of Egypt. @t[=331 BCE] It became the intellectual capital of the Hellenistic world, home to the Great Library and the Pharos Lighthouse, and served as the capital of Ptolemaic Egypt from 305 to 30 BCE. @t[305 BCE..30 BCE]

Key Facts

  • Location: Mediterranean coast of Egypt, western Nile Delta 1
  • Founded: 331 BCE by Alexander the Great @t[=331 BCE] 1
  • Capital of: Ptolemaic Egypt (30530 BCE) @t[305 BCE..30 BCE] 1
  • Peak population: ~500,0001,000,000 (among the largest cities in the ancient world) 1

Major Features

  • Great Library of Alexandria: Largest library of the ancient world, ~400,000700,000 scrolls @t[305 BCE..30 BCE] 1
  • Mouseion (Museum): Research institution attached to the Library, founded under Ptolemy I @t[~295 BCE] 1
  • Pharos Lighthouse: One of the Seven Wonders, ~100130 m tall, built ~280 BCE @t[~280 BCE] 2
  • Serapeum: Temple of Serapis, housed a branch of the Library's collection 1

Intellectual Legacy

Scholars active in Alexandria during the Ptolemaic and Roman periods:

  • Euclid: Elements of geometry, active ~300 BCE @t[~300 BCE] 3
  • Eratosthenes (~276195 BCE): Calculated Earth's circumference; served as head of the Library ~240195 BCE @t[~276 BCE..~195 BCE] 3
  • Aristarchus of Samos (~310230 BCE): Proposed heliocentric model @t[~310 BCE..~230 BCE] 3
  • Ptolemy (Claudius, ~100170 CE): Almagest (astronomy), Geography @t[~100..~170] 3
  • Septuagint: Greek translation of the Hebrew Bible, produced in Alexandria under Ptolemy II (~285246 BCE) @t[~285 BCE..~246 BCE] 3

Decline and Later History

  • 48 BCE: Julius Caesar's forces accidentally burned a warehouse containing books near the harbor, sometimes conflated with the Library itself @t[=48 BCE] 4
  • 30 BCE: Roman conquest; Alexandria became capital of the Roman province of Egypt @t[=30 BCE] 1
  • 391 CE: Bishop Theophilus ordered destruction of the Serapeum, which housed a branch collection @t[=391] 4
  • 641/642 CE: Arab conquest of Egypt under Amr ibn al-As ended the Greco-Roman period @t[=641] 4
  • The Library's decline was gradual, spanning centuries of reduced funding and civil unrest — no single catastrophic fire destroyed it 4

Recent Archaeology

Ongoing underwater excavations in Abu Qir Bay (near Alexandria) have recovered statues, coins, pottery, and architectural fragments from the submerged Ptolemaic-era cities of Canopus and Heracleion, which sank due to earthquakes and rising sea levels in the 2nd century CE. 5



  1. Casson, L. Libraries in the Ancient World (Yale, 2001) ↩︎

  2. McKenzie, J. The Architecture of Alexandria and Egypt (Yale, 2007) ↩︎

  3. Netz, R. & Noel, W. The Archimedes Codex (Da Capo, 2007); individual dates per standard scholarly consensus (Britannica, World History Encyclopedia) ↩︎

  4. El-Abbadi, M. Life and Fate of the Ancient Library of Alexandria (UNESCO, 1990) ↩︎

  5. Goddio, F. & Fabre, D. Egypt's Sunken Treasures (Prestel, 2008); ongoing excavations reported by Egyptian Ministry of Tourism and Antiquities (2025) ↩︎