(probably from Latin fas, "divine law"), in ancient Rome, sacred calendar of the dies fasti, or days of the month on which it was permitted to transact legal affairs; the word also denoted registers of various types. The fasti were first exhibited in the Forum in 304 BC by the aedile Gnaeus Flavius, who broke a patrician monopoly on their use, and thereafter such lists became common. They usually contained not only the months and days of the year, together with the different festivals, but also a variety of other information, such as the dates of military victories and temple dedications. The fasti were carved in stone or marble, although they are also extant in manuscript form. About 20 survive in different states of completeness
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