I have 62 Ephebian and Oplaphoros is saying he won't list his goods to me until I can understand the language.
Perhaps the number is different for him than regular citizens, or perhaps there's some component of written required? (I only have 39)
Just to clarify: this is the check *before* trying to buy, which should just require language. Regardless I have 200 ephebian culture bonus and 500+ polearm.