I'm assuming those are notable historical figures from your world. Odds say a variation of 'Earth.' At least ninety percent of people seem to be from there.

I'm from a world called Thusia. Slavery has not been present in some time, but it is hard to think the concept on any world encourages those enslaved to think of their own health and wellbeing.

There were slave owners who were some measure of "kind," but that kindness would be more akin to worrying about the health of one's pet versus another person.

Admittedly, a lot of Verinne's flock were in such a position. Allowing one to live past their end made for rather heavy leverage.