Racism is in Western culture, linked to certain conceptions of human nature which justify the discrimination of human beings in order to operate.
By the end of the Middle Ages (XV century), the discrimination was based on two types of arguments: those based on culture and social support provided.
The Greeks are mainly supported the first type of arguments. They felt superior in relation to other people because they were more educated.
During the Roman Empire and Middle Ages, preponderam discrimination based on social condition. The nobles in the Middle Ages, for example, were recognized as superior in relation to other social groups, because they enjoyed certain privileges which they had inherited or been assigned by a King These and other privileges established a hierarchy between human beings, so that some were recognized as superior to others.