Slavery was known in almost every ancient civilization, such as Ancient Egypt, Ancient China, the Akkadian Empire, Assyria, Ancient India, Ancient Greece, the Roman Empire, the Islamic Caliphate, and the pre-Columbian civilizations of the Americas. These institutions were a composed of debt-slavery, punishment for crime, the enslavement of prisoners of war, child abandonment, and the birth of slave children to slaves. slavery in Ancient Greece started from Mycenaean Greece. Twenty percant of the population of Classical Athens were slaves. The men are become slaves by nature call as natural slavery ,it is accepted by the Aristotle. after the Roman Republic expanding outward, the enslaved become pominant these are consist of Europe and the Mediterranean. Greeks, Illyrians, Berbers, Germans, Britons, Thracians, Gauls, Jews, Arabs, and many more were slaves used not only for labour, but also for amusement. The late Republican era, slavery had become a vital economic pillar in the wealth of Rome and very significant part of Roman society. over 25% of the population of Ancient Rome was enslaved. During the emergence of the Roman Empire to its eventual decline, at least 100 million people were captured or sold as slaves throughout the Mediterranean and its hinterlands.