Religion in ancient Rome

Religion in ancient Rome was polytheistic, consisted of varying imperial and provincial religious practices, which were followed both by the Roman people as well as those who were brought under its rule.

The Romans thought of themselves as highly religious, and attributed their success as a world power to their collective piety (pietas) in maintaining good relations with the gods. Their polytheistic religion is known for having honoured many deities.

The presence of Greeks on the Italian Peninsula from the beginning of the historical period influenced Roman culture, introducing some religious practices that became fundamental, such as the cultus of Apollo. The Romans looked for common ground between their major gods and those of the Greeks (interpretatio graeca), adapting Greek myths and iconography for Latin literature and Roman art, as the Etruscans had. Etruscan religion was also a major influence, particularly on the practice of augury, used by the state to seek the will of the gods. According to legends, most of Rome's religious institutions could be traced to its founders, particularly Numa Pompilius, the Sabine second king of Rome, who negotiated directly with the gods. This archaic religion was the foundation of the mos maiorum, "the way of the ancestors" or simply "tradition", viewed as central to Roman identity.

Roman religion was practical and contractual, based on the principle of do ut des, "I give that you might give". Religion depended on knowledge and the correct practice of prayer, rite, and sacrifice, not on faith or dogma, although Latin literature preserves learned speculation on the nature of the divine and its relation to human affairs.