There's a part of the story where demons are negotiating peace between a town and attacking demon forces. As soon as Frieren hears of this, she says the town is doomed.
Moral of the story is if your problems are caused by a group, don't expect a member of that same group to help you solve that problem.
Tell me. The Greeks are the earliest I know of, but I assume it began in prehistory.
*Buzz
Wrongo. Greek and Roman traditions of slavery were very, very different from the modern notion of slavery, which is better referred to as chattel slavery.
In that Greek slavery was worse, yes. You'd much rather be a slave on a plantation than be one in the silver mines, being worked to death.
Far longer than there have been "humans" there has been slavery. Our pre-human ancestors were smart enough to know that forcing someone else to do hard work for you was a good idea. & etc.
Note: we humans are homo sapiens and there were lots of other "proto-humans" before we arrived.