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Role in the Roman State
During the Regal Period of Roman history, the pontiffs were primarily concilia (advisers) of the kings, but after the expulsion of the last Roman King Lucius Tarquinius Superbus in 510 BC, the College of Pontiffs became religious advisers to the Roman Senate. As the most important of the four priestly colleges, the college of pontiffs’ duties involved advising the senate on issues pertaining to the gods, the supervision of the calendar and thus the supervision of ceremonies with their specific rituals, and the appeasement of the gods upon the appearance of prodigies.

One of their most important duties was their guardianship of the libri pontificales, or pontifical books. Among these were the acta, indigitamenta (lists of invocations or names of deities), ritualia, commentarii, fasti, and annales (yearly records of magistrates and important events). These items were under the sole possession of the college of pontiffs and only they were allowed to consult these items when necessary.

The lex Acilia bestowed power on the college to manage the calendar. Thus, they determined the days which religious and political meetings could be held, when sacrifices could be offered, votes cast, and senatorial decisions brought forth.

The College of Pontiffs came to occupy the Regia (the old palace of the kings) during the early Republican Period. They came to replace the religious authority that was once held by the king. A position, the Rex Sacrorum, was even created to replace the king for purposes of religious ceremonies. Rex Sacrorum also known as the "king of rites" in the late Republican period was not a leading political figure anymore, the pontifex maximus became the most powerful of the political priests. The pontifex maximus was the spokesperson for the college and was seen to be the most prominent and influential of the priests.

When Christianity became the official religion of the Roman Empire, Pope Leo I began using the title Pontifex Maximus around 440 to emphasize the authority of the Pope. The term "chief priests" in the New Testament (e.g. Mark 15:11) is translated as Pontifices in the Latin Vulgate and "high priest" as Pontifex in Hebrews 2:17, etc.