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Gold coin depicting Ptolemy III issued by Ptolemy IV to honor his deified father.

Statue of Ptolemy III in the guise of Hermes wearing the chlamys cloak. Ptolemaic Egypt.

Bronze coin issued by Ptolemy III depicting (obverse) Zeus-Amun and (reverse) the traditional Ptolemaic eagle. Ptolemy III did not issue coins with his own image.

Ptolemy III Euergetes, (Greek: Πτολεμαίος Ευεργέτης, reigned 246 BC–222 BC) is sometimes called Ptolemy III Euergetes I. The third ruler of the Ptolemaic dynasty in Egypt, he was the eldest son of Ptolemy II Philadelphus and his first wife Arsinoe I. He came to power in 246 BC upon the death of his father. He is most noted for his invasions of the northern kingdom of Syria which he commenced upon the murder of his eldest sister Berenice Phernophorus; during this war, the Third Syrian War, he occupied Antioch and -as a recent cuneiform discovery proves- even reached Babylon.^[1] Ptolemy III was also the ruler who promoted the translation of Jewish scriptures into Greek as the Septuagint.

He married Berenice of Cyrene in the year corresponding to 244/243 BC; and they were parents of Arsinoe III and Ptolemy IV Philopator.

Ptolemy III Euergetes was responsible for the first known example of a series of decrees published as bilingual inscriptions on massive stone blocks in three writing systems. Ptolemy III's stone stela is the Canopus Stone of 238 B.C.E. Other well-known examples are the Memphis Stele, or Memphis Stone, bearing the Decree of Memphis, about 218 B.C.E, passed by his son, Ptolemy IV, and the famous Rosetta Stone erected by Ptolemy V his grandson, in 196 BC.

Ptolemy III's stone contains decrees about priestly orders, and is a memorial for his daughter Berenice. But two of its 26 lines of hieroglyphs decree the use of a leap day added to the Egyptian calendar of 365 days, and the associated changes in festivals.

He is also credited with the foundation of the Serapeum in Alexandria.

• Ptolemaic Egypt- Egyptian history during the Ptolemaic dynasty.
• Ptolemais - towns and cities named after members of the Ptolemaic dynasty.
• Leap year
• Decree of Canopus–(Canopus Stele)

1. ^ See the Ptolemy III chronicle

• Ptolemy Euergetes I at LacusCurtius — (Chapter VI of E. R Bevan's House of Ptolemy, 1923)
• Ptolemy III — (Royal Egyptian Genealogy)
• Ptolemy III Euergetes entry in historical sourcebook by Mahlon H. Smith