What is a person from rome called?

A Roman citizen was a inhabitants of the city of Rome. This applied only to freeborn people. Roman citizenship was extended to all the peoples of Italy after the Italian War (91-87 BC). Emperor Caracalla extended Roman citizenship to all free men in the Roman Empire in 212 AD.

Slaves did not have Roman citizenship. However, freedmen in the city of Rome were eligible to Roman citizenship on the ground of permanent residence in the city. As the Romans were in the habit of freeing their slaves, at one point the majority of the citizens of the city of Rome were freemen or their descendants.