In the understanding of the Romans, a slave was associated with a foreigner, Just as the ancient Greeks considered all barbarians to be an inferior race, whose natural state was slavery, the Romans shared the same views. For example, Cicero wrote about the widespread belief that some races are destined for slavery.
Another significant difference between Ancient Rome and Ancient Greece was a much more thorough study of the legal side of the issue. Slavery in ancient Rome was clearly regulated by legal acts. It was determined that a full-fledged Roman citizen could not be enslaved. It was also possible to release slaves to freedom only by law, in accordance with the established procedure. Roman laws divided the legal status of a non-Roman, for example, “peregrine” (personally free foreigner) and a freedman (former slave).
Another fundamental difference was the single legal space of the entire ancient Roman state, in contrast to the Greek polis system. A slave remained a slave in any city of the Roman Empire, as well as a free citizen. But in ancient Greece, a free citizen of one of the policies could well have been turned into slavery in another policy, since he was a stranger there and had no legal protection.
And finally, a striking cultural difference was the absence of gladiatorial games and gladiator slaves in Ancient Greece. The legal status of gladiators differed from the usual slave, slaves were sold to gladiators either according to the appropriate legal procedure, or free citizens by court order.