sep 4, 246 BC - 246 BC - Ptolemy III joins Third Syrian War

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He abandoned his predecessors' policy of keeping out of the wars of the other Macedonian successor kingdoms, and plunged into the Third Syrian War (246–241 BC) with the Seleucid Empire of Syria, when his sister, Queen Berenice, and her son were murdered in a dynastic dispute. Ptolemy marched triumphantly into the heart of the Seleucid realm, as far as Babylonia, while his fleets in the Aegean Sea made fresh conquests as far north as Thrace.

This victory marked the zenith of the Ptolemaic power. Seleucus II Callinicus kept his throne, but Egyptian fleets controlled most of the coasts of Anatolia and Greece. After this triumph Ptolemy no longer engaged actively in war, although he supported the enemies of Macedon in Greek politics. His domestic policy differed from his father's in that he patronised the native Egyptian religion more liberally: he left larger traces among the Egyptian monuments. In this his reign marks the gradual Egyptianisation of the Ptolemies.

Ptolemy III continued his predecessor's sponsorship of scholarship and literature. The Great Library in the Musaeum was supplemented by a second library built in the Serapeum. He was said to have had every book unloaded in the Alexandria docks seized and copied, returning the copies to their owners and keeping the originals for the Library.[19] It is said that he borrowed the official manuscripts of Aeschylus, Sophocles, and Euripides from Athens and forfeited the considerable deposit he paid for them in order to keep them for the Library rather than returning them. The most distinguished scholar at Ptolemy III's court was the polymath and geographer Eratosthenes, most noted for his remarkably accurate calculation of the circumference of the world. Other prominent scholars include the mathematicians Conon of Samos and Apollonius of Perge.[18]

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