What is the title of the chief priest in Roman religion?

The title of the chief priest in Roman religion is Pontifex Maximus. This role was essentially the highest religious office and played a critical part in overseeing the religious practices and rituals within the Roman state. The Pontifex Maximus was responsible for maintaining the relationship between the gods and the Roman people, overseeing other priests, and holding significant influence in both religious and political matters.

The position of Pontifex Maximus dates back to early Roman history, and it became increasingly important as the state expanded. The individual holding this title was typically involved in making critical decisions about religious matters, including the scheduling and conduct of rituals, and was considered the highest authority in religious law and practice. Additionally, the role eventually became associated with the emperor, especially from the time of Augustus, underscoring its importance in the governance of the state as well as in religious life.

The other choices represent different roles within the Roman religious structure: a Flamen was a priest dedicated to a specific god, an Augur specialized in interpreting omens, and a Sacerdos was a general term for a priest. While all these roles were important within the Roman religious framework, none held the overarching authority and prominence of the Pontifex Maximus.