The gens Cornelia was one of the greatest patrician houses at ancient Rome. For more than seven hundred years, from the early decades of the Republic to the third century AD, the Cornelii produced more eminent statesmen and generals than any other gens. At least seventy-five consuls under the Republic were members of this family, beginning with Servius Cornelius Maluginensis in 485 BC. Together with the Aemilii, Claudii, Fabii, Manlii, and Valerii, the Cornelii were almost certainly numbered among the gentes maiores, the most important and powerful families of Rome, who for centuries dominated the Republican magistracies. All of the major branches of the Cornelian gens were patrician, but there were also plebeian Cornelii, at least some of whom were descended from freedmen.

The patricians were originally a group of ruling class families in ancient Rome. The distinction was highly significant in the Roman Kingdom and the early Republic, but its relevance waned after the Conflict of the Orders. By the time of the late Republic and Empire, membership in the patriciate was of only nominal significance. The social structure of ancient Rome revolved around the distinction between the patricians and the plebeians. The status of patricians gave them more political power than the plebeians, but the relationship between the groups eventually caused the Conflict of the Orders. This time period resulted in changing of the social structure of ancient Rome.