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Flamen (250–260 AD)
In ancient Roman religion, the Arval Brethren (Latin: Fratres Arvales, "Brothers of the Fields") or Arval Brothers were a body of priests who offered annual sacrifices to the Lares and gods to guarantee good harvests. Inscriptions provide evidence of their oaths, rituals and sacrifices.
Roman legend held that the priestly college was originated by Romulus, who took the place of a dead son of his nurse Acca Laurentia, and formed the priesthood with the remaining eleven sons. They were also connected originally with the Sabine priesthood of Sodales Titii who were probably originally their counterpart among the Sabines.
The brethren dated back to the time of Numa Pompilius, second king of Rome, and persisted to the imperial period. Their task was the worship of Dea Dia, an old fertility goddess and probably an aspect of Ceres. On the three days of her May festival, they offered sacrifices and chanted secretly inside the temple of the goddess at her lucus the Carmen Arvale, the exact meaning of which was no longer understood in later times. The magister (master) of the college selected the exact three days of the celebration by an unknown method. The celebration began in Rome on the first day, was transferred to a sacred grove outside the city wall on the second day and ended back in the city on the third day.
Structure and duties 
Arval Brethren formed a college of twelve priests, although archaeologists have found only up to nine names at a time in the inscriptions. They were appointed for life and did not lose their status even in exile. Their sign was a white band with the chaplet of sheaves of grain.
The Brethren assembled in the Regia.
Their duties included ritual propitiations or thanksgivings as the Ambarvalia, the sacrifices done at the borders of Rome at the fifth mile of the Via Campana or Salaria (a place now on the hill Monte delle Piche at the Magliana Vecchia on the right bank of the Tiber). Before the sacrifice, the sacrificial victim was led three times around a grain field where a chorus of farmers and farm-servants danced and sang praises for Ceres and offered her libations of milk, honey and wine.
Archaic traits of the rituals included the prohibition of the use of iron, the use of the olla terrea (a jar made of unbaked earth) and of the sacrificial burner of Dea Dia made of silver and adorned with grassy clods.
Restoration of the priesthood 
The importance of Arval Brethren apparently dwindled during the Roman Republic, but emperor Augustus revived their practices to enforce his own authority. After Augustus' time emperors and senators frequented the festivities. At least two emperors, Marcus Aurelius and Elagabalus, were formally accepted as members of the Brethren. The first full descriptions of their rituals also originate from this time.
The last inscriptions (Acta Arvalia) about the Arval Brethren date from about 325 AD. They were abolished along with Rome's other traditional priesthoods by 400 AD.
- "Arval Brothers on Britannica". Retrieved August 20, 2012.