In ancient times the priests were recognized as a special social caste, and were distinguished not only by their sacerdotal vestments, but also by their piety, wisdom, and blameless life. They were the chosen mediators between gods and men, and offered prayers and sacrifices in the name of the people, whom they also instructed as to what vows, gifts, and offerings would be most acceptable to the gods.

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Every deity had a different order of priests consecrated to his worship, and in every place a high-priest was appointed, whose duty it was to superintend the rest of his order, and also to carry out the more sacred rites and religious observances.

Priests and priestesses were permitted to marry, but not a second time; some, however, voluntarily adopted a life of celibacy.