Who where the non citizens of ancient Rome?

Everyone who was born into a Roman family was a Roman citizen. Foreigners were not Roman citizens. In the 1st century AD the various peoples of Italy were granted Roman citizenship. Prior to 212 AD the conquered peoples in the Roman Empire were not Roman citizens. In that year the emperor Caracalla extended Roman citizenship to all the free men ion the empire. Slaves were not given citizenship. Before this, the Romans often granted Roman citizenship to elite men of their allies or conquered peoples who showed loyalty to Rome.