The archetypal and best-known form of unfree labour is chattel slavery, in which individual workers are legally owned throughout their lives, and may be bought, sold or otherwise exchanged by owners, while never or rarely receiving any personal benefit from their labour. Slavery was common in many ancient societies, including ancient Egypt, Babylon, Persia, ancient Greece, Rome, ancient Israel, ancient China, classical Arab states, as well as many societies in Africa and the Americas. Being sold into slavery was a common fate of populations that were conquered in wars. Perhaps the most prominent example of chattel slavery was the enslavement of many millions of black people in Africa, as well as their forced transportation to the Americas, Asia, or Europe, where their status as slaves was almost always inherited by their descendants.