Pietas

Pietas, translated variously as "duty", "religiosity" or "religious behavior", "loyalty", "devotion", or "filial piety" (English "piety" derives from the Latin), was one of the chief virtues among the ancient Romans. It was the distinguishing virtue of the founding hero Aeneas, who is often given the adjectival epithet pius ("religious") throughout Vergil's epic Aeneid. The sacred nature of pietas was embodied by the divine personification Pietas, a goddess often pictured on Roman coins. The Greek equivalent is eusebeia (εὐσέβεια).

Cicero defined pietas as the virtue "which admonishes us to do our duty to our country or our parents or other blood relations." The man who possessed pietas "performed all his duties towards the deity and his fellow human beings fully and in every respect," as the 19th-century classical scholar Georg Wissowa described it.

As virtue

Pietas erga parentes ("pietas toward one's parents") was one of the most important aspects of demonstrating virtue. Pius as a cognomen originated as way to mark a person as especially "pious" in this sense: announcing one's personal pietas through official nomenclature seems to have been an innovation of the late Republic, when Quintus Caecilius Metellus Pius claimed it for his efforts to have his father, Numidicus, recalled from exile.Pietas extended also toward "parents" in the sense of "ancestors," and was one of the basic principles of Roman tradition, as expressed by the care of the dead.