Ptolemy III Euergetes

Ptolemy III launched a campaign against the Seleucid Empire following the murder of his sister Berenice. He conquered large parts of Syria, Anatolia, and Mesopotamia, reaching Babylon. The war ended with a peace treaty in 241 BC, securing Ptolemaic control over Seleucid territories.

Ptolemy III dedicated captured Seleucid territories to the Egyptian gods in a grand ceremony. This act reinforced his legitimacy as a pharaoh and demonstrated the wealth and power of the Ptolemaic Kingdom at its territorial peak.

Under Ptolemy III, the Ptolemaic Kingdom reached its greatest territorial extent, controlling Egypt, Cyrenaica, Cyprus, Coele-Syria, and parts of Anatolia and the Aegean. This period marked the height of Ptolemaic power and influence in the Mediterranean.

Ptolemy III expanded the Library of Alexandria, ordering the translation of Greek and foreign texts. He also decreed that all ships docking in Alexandria must surrender their books for copying, greatly increasing the library's collection.