The Roman people was the ethnicity and the body of Roman citizens(Latin: Rōmānī; Ancient Greek: Ῥωμαῖοι Rhōmaîoi) during the Roman Kingdom, the Roman Republic, and the Roman Empire. This concept underwent considerable changes throughout the long history of the Roman civilisation, as its borders expanded and contracted. Originally only including the ethnic Latins from Rome itself, Roman citizenship was extended to the rest of the Italic peoples by the 1st century BC and to nearly every subject of the Roman empire in late antiquity. At their peak, the Romans ruled large parts of Europe, the Near East, and North Africa through conquests made during the Roman Republic and the subsequent Roman Empire. Although defined primarily as a citizenship, "Roman-ness" has also and variously been described as a cultural identity, a nationality, or a multi-ethnicity that eventually encompassed a vast regional diversity.
Citizenship grants, demographic growth, and settler and military colonies rapidly increased the number of Roman citizens. The increase achieved its peak with Emperor Caracalla's AD 212 Antonine Constitution, which extended citizenship rights to all free inhabitants of the empire. Roman identity provided a larger sense of common identity and became important when distinguishing from non-Romans, such as barbarian settlers and invaders. Roman culture was far from homogeneous; though there was a common cultural idiom, one of the strengths of the Roman Empire was also its ability to incorporate traditions from other cultures, notably but not exclusively Greece.