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I'm surprised you're being downvoted. This is an important facet of the history of slavery that people tend to forget / ignore today.

The article ("Did Neanderthals go to war with our ancestors?") is about events that took place ~100k years ago at the very latest.

The GP post is talking about things the happened ~2.5k years ago (greek slavery) and less than 0.5k years ago (african slavery).

It's off-topic. Not incorrect, not unimportant. Just off-topic.

It was on topic to what GP was replying to, though. It's fine for discussions to wander.