Apparently slaves there were not considered inferior, anyone could end up in that situation. For example, the often lauded Epictetus was a slave.
What do you mean by this? The wealthiest and most influential of ancient Greek society could also end up as slaves in their own communities?
Even during the conquer of the muslin kingdom of Granada a lot of the citizens were sold as slaves.
Apparently slaves there were not considered inferior, anyone could end up in that situation. For example, the often lauded Epictetus was a slave.