Ptolemy II Philadelphus
Zeno was a native of the Greek town of Kaunos in Caria in southwestern Asia Minor. He moved to the town of Philadelphia in Egypt, a busy market town that had been founded on the edge of the Faiyum by Ptolemy II Philadelphus in honour of his sister Arsinoe II. From the 3rd century BC until the 5th century CE, Philadelphia was a thriving settlement that relied on agriculture for its economic success. At Philadelphia, Zeno became a private secretary to Apollonius, the finance minister to Ptolemy II Philadelphus and Ptolemy III Euergetes.