Greek philosopher Aristotle justified this practice by claiming that humanity is divided into two classes, that of the masters and that of the slaves, with the former having a natural right to command, whereas the latter were simply born to obey.
وقد برّر الفيلسوف اليوناني أرسطو هذه العادة بالادّعاء ان البشرية مقسّمة الى طبقتين :‏ الاسياد والعبيد ،‏ وأن الاسياد لديهم حق طبيعي بإصدار الاوامر ،‏ اما العبيد فهم مخلوقون ليطيعوا .‏