After the death of Ptolemy II , he was succeeded by his son Ptolemy III . He was 30 years old when he ascended to the throne .
As soon as he became the King of
, news reached him about the death of the Seleucus King who was his brother-in-law and that the life of his sister and his nephew were in danger . so he decided to lead a campaign to save them . But before his departure from Egypt to Asia Minor , the news of the death of his sister and his nephew reached him . However , he continued his campaign to revenge their death . When he reached Syria , he succeeded in achieving a great victory over the Seleucus Kingdom in what is known as the Third Syrian War and he defeated the Seleucus King in a famous battle , but little was recorded about this battle .
Coele-Syria: this area was full of cedar wood and polemics in Egypt needed the cedar wood to build a strong navy and to bring the cedar wood from Coele-Syria Egypt the sixth wars of Syria took place .
Before his departure , he married his cousin Queen Bernice II , daughter of Magas (ruler of Libya) . Bernice II began to rule Egypt while Ptolemy III was away in his
campaign , but she couldn’t control the whole country due to some unrest accompanied by low inundation (flood) which resulted in a famine or a starvation in Egypt so when he returned back to Egypt , he distributed wheat and corn among the Egyptians to lessen the burden of famine on the population . These wheat and corn brought from Syria as booty . He also brought back some statues of the Egyptian deities which Cambyes took from Egypt few hundred years earlier . Then he used excessive force to put down the revolts of the Egyptians , as a result , he was hated by the Egyptian people .