Pontifex maximus in the context of "Flamen Dialis"

In ancient Rome, the Vestal Virgins or Vestals (Latin: Vestālēs, singular Vestālis [wɛsˈtaːlɪs]) were priestesses of Vesta, virgin goddess of Rome's sacred hearth and its flame.

The Vestals were unlike any other public priesthood. They were chosen before puberty from several suitable candidates, freed from any legal ties and obligations to their birth family, and enrolled in Vesta's priestly college of six priestesses. They were supervised by a senior vestal but chosen and governed by Rome's leading male priest, the pontifex maximus—in the Imperial era, this meant the emperor.

The Roman emperor was the ruler and monarchical head of state of the Roman Empire, starting with the granting of the title augustus to Octavian in 27 BC. The title of imperator, originally a military honorific, was usually used alongside caesar, originally a cognomen. When a given Roman is described as becoming emperor in English, it generally reflects his accession as augustus, and later as basileus. Early emperors also used the title princeps ("first one") alongside other Republican titles, notably consul and pontifex maximus.

The legitimacy of an emperor's rule depended on his control of the Roman army and recognition by the Senate; an emperor would normally be proclaimed by his troops, or by the Senate, or both. The first emperors reigned alone; later emperors would sometimes rule with co-emperors to secure the succession or to divide the administration of the empire between them. The office of emperor was thought to be distinct from that of a rex ("king"). Augustus, the first emperor, resolutely refused recognition as a monarch. For the first three hundred years of Roman emperors, efforts were made to portray the emperors as leaders of the Republic, fearing any association with the kings who ruled Rome prior to the Republic.

Aemilia, Licinia and Marcia were Roman vestal Virgins, who were prosecuted for having broken the vow of chastity in two famous trials between 115 and 113 BC. The first trial was conducted by the Pontifex Maximus Metellus Delmaticus, who sentenced Aemilia to death in 114 BC. The decision to spare the other two vestals triggered outrage and led to a follow-up trial headed by Cassius Longinus Ravilla. Licinia and Marcia were subsequently put to death as well. The trials were heavily influenced by the political background and network of the participants.

Numa Pompilius (Classical Latin: [ˈnʊma pɔmˈpɪliʊs]; c. 753–672 BC; reigned 715–672 BC) was the legendary second king of Rome, succeeding Romulus after a one-year interregnum. He was of Sabine origin, and many of Rome's most important religious and political institutions are attributed to him, such as the Roman calendar, Vestal Virgins, the cult of Mars, the cult of Jupiter, the cult of Romulus, and the office of pontifex maximus.

Marcus Aemilius Lepidus (/ˈlɛpɪdəs/; c. 89 BC – late 13 or early 12 BC) was a Roman general and statesman who formed the Second Triumvirate alongside Octavian and Mark Antony during the final years of the Roman Republic. Lepidus had previously been a close ally of Julius Caesar. He was also the last pontifex maximus before the Roman Empire, and (presumably) the last interrex and magister equitum to hold military command.

Though he was an able military commander and proved a useful partisan of Caesar, Lepidus has always been portrayed as the least influential member of the Triumvirate. He typically appears as a marginalised figure in depictions of the events of the era, most notably in Shakespeare's plays. While some scholars have endorsed this view, others argue that the evidence is insufficient to discount the distorting effects of propaganda by his opponents, principally Cicero and, later, Augustus.

Gratian (/ˈɡreɪʃiən/; Latin: Gratianus; 18 April 359 – 25 August 383) was emperor of the Western Roman Empire from 367 to 383. The eldest son of Valentinian I, Gratian was raised to the rank of Augustus as a child and inherited the West after his father's death in 375. He nominally shared the government with his infant half-brother Valentinian II, who was also acclaimed emperor in Pannonia on Valentinian's death. The East was ruled by his uncle Valens, who was later succeeded by Theodosius I.

Gratian subsequently led a campaign across the Rhine, attacked the Lentienses, and forced the tribe to surrender. That same year, the eastern emperor Valens was killed fighting the Goths at the Battle of Adrianople, which led to Gratian elevating Theodosius to replace him in 379. Gratian favoured Nicene Christianity over traditional Roman religion, issuing the Edict of Thessalonica, refusing the office of pontifex maximus, and removing the Altar of Victory from the Roman Senate's Curia Julia. The city of Cularo on the Isère river in Roman Gaul was renamed Gratianopolis after him, which later evolved to Grenoble. By 383 Gratian had become unpopular with his army, which abandoned him during a confrontation with the usurper Magnus Maximus near Lutetia (Paris). Gratian fled to Lugdunum and was later murdered.