The date of the addition used to be subject of a scholarly discourse,[1] but modern researchers[2] agree with William Scott Ferguson who (in 1932) suggested that the event took place in 224–223 B.C..[1] Ptolemy III was chosen as one of the Eponymous Heroes due to urgency of keeping friendship with Ptolemaic Egypt.
[3] The Monument of the Eponymous Heroes had one statue added, starting the so-called Period III.
While the Athenians added the new phyle to their list at the 7th place,[4] modern researchers use the Roman numeral XIII to designate Ptolemais.
The 13 demes that formed Ptolemais were collected from all 12 old phylai ("rule-of-one"), with the 13th, Berenicidae, newly created[5] and named after Berenice II, wife of Ptolemy III.
There was a scientific discourse on the subject, with Pritchett (1942) arguing that the "Macedonian" tribes Antigonis and Demetrias were spared.