...and we have Epicurus who was a slave.
I don't think Epicurus was a slave. He did admit slaves to his school though, which is not something that was typical for his time. Perhaps you are referring to the Stoic, Epictetus, who definitely was a slave (although, white-collar).
Whups, you're right. Some of the Greek philosophers' names are so easy to confuse (I still confuse Xenophanes and Xenophon). Well, Epictetus was still important, if not as important as Epicurus.
Another month has passed and here is a new rationality quotes thread. The usual rules are: