Just a point, Europeans were the only ones to do _chaptel slavery_, i.e treating fellow humans (even if they are currently slave) as object they own and have ev

Just a point, Europeans were the only ones to do _chaptel slavery_, i.e treating fellow humans (even if they are currently slave) as object they own and have every right over them. Other form of slavery were either topologically or chronologically limited. This wasn't the case for European chaptel slavery: your sons and daughter were also property, and changing localtion did not indure you to another lord, but gave him right to pursue you across the world (also, chains were mostly used during triomphs, but chained slave were in practice extremely rare, even in mines)