Rome's government, politics and religion were dominated by an educated, male, landowning military aristocracy. Approximately half Rome's population were slave or free non-citizens. Most others were plebeians, the lowest class of Roman citizens. Less than a quarter of adult males had voting rights; far fewer could actually exercise them. Women had no vote. However, all official business was conducted under the divine gaze and auspices, in the name of the senate and people of Rome. "In a very real sense the senate was the caretaker of the Romans’ relationship with the divine, just as it was the caretaker of their relationship with other humans".
What was the other half of roman population alongside the non-citizens?
citizens