How Phoenician was Stoicism?

Was Zeno a Greek philosopher or a foreign one?

"You slip in, Zeno, by the garden door — I'm quite aware of it — you filch my doctrines and give them a Phoenician make-up."

This intriguing remark was reportedly made by Polemo of Athens, the head of the Platonic Academy. He is accusing Zeno of Citium, the founder of Stoicism, of pinching ideas from his philosophy. Stoicism was perceived by some Greek…