Ptolemy V came to the throne at the age of 5. Due to his young age, the country plunged in weakness featuring corruption and conspiracies.
Egypt lost many of its possessions like south Syria which was attacked by the Seleucid King Antiochus III.

Rosetta Stone

The chaos reached its peak when native Egyptians succeeded in establishing a line of kings at Thebes (Luxor) but the movement was crushed by Ptolemy V.
Ptolemy V was crowned at the age of 12 as king. The ceremony took place at Memphis and the decree was written on a stone in 3 languages, the hieroglyphics, the demotic and the Greek.
This stone was later known as Rosetta stone. It allowed modern scholars to know all about the hieroglyphics and deciphering its letters whose secret remained unknown for long periods.

Ptolemy married Cleopatra I, the daughter of the Seleucid King Antiochus III. It was a political marriage that granted peace between Egypt and Syria for some time.

Ptolemy V died, leaving 2 sons and a daughter. They were Ptolemy VI Philometor, Ptolemy VIII Euergetes II and Cleopatra II.