A question Didymos: Was the "mystery pen" (<-- nice choice of words btw) a philosopher in the full meaning of the word or just, say, a slave who also was a philosopher?

He was not owned by any man or institution. Sometimes the desire to keep one's head drives creative work.

Marcus Tullius Cicero

Nope, not the Roman statesman.

Unless you tell me the person you quoted is not a Roman, I will only be able to think of Romans. So, if it is fair to ask the question of rather or not he/she is a Roman, I do so now.

The author is not a Roman.

May I ask if this mystery pen was a social contract theorist?