Ptolemy III. Euergetes made a contribution to the greatest expansion of Egypt. His father Ptolemy II. made two wars on Syria and the third Syrian war burst out under Ptolemy III's rule because of another Berenice – it was Ptolemy II's own sister that time.
The Syrian King Antiochus II. divorced his wife (and cousin) Laodice and married just this Berenice. But he made his peace with the ex-wife and established their son Seleucus II. as his successor before his death. So the son of him and Berenice was excluded out of the successorship. Ptolemy III. gave the fleet to Berenice to have the use of it, which had its base on Cyprus. Then he set out to the northern Syria with his fleet, where he occupied the port Seleucia and went on into the capital of Seleucid dynasty – Antioch.
Ptolemy III. penetrated up into Babylonia, but the followers of Laodice murdered Berenice and her son as well in the meantime. Ptolemy III. had to return to Egypt, because an uprising against taxes rise burst out there, but he returned with big booty and ensured his position in the northern Syria, Cilicia, Caria, in Ionic cities on the western coast of Asia Minor and even on the European coast of Hellespont.
Ptolemy III. devoted to Empire's internal affairs after his return from the war. He made several non-violent administrative and financial reforms, made the conditions for both the old and the new Greek residents more favourable and reserved a special district for Jewish immigrants in Alexandria. Ptolemy III supported the trade, crafts and mining. He also let build many temples and public buidings and found settlements at the Red Sea as well.
Ptolemy III. Euergetes