Could someone tell me if there was a period in European history prior to the age of exploration where institutionalized slavery existed nowhere? If so, who was the last (European) nation to end the institution of slavery in post-classical eras and when was it?
Edit: I mean Slavery as institutions where it is clear that humans are owned as property. I don't believe serfdom had all of those qualities in the fullest sense like New World slavery or the slavery of ancient Rome.