The ''Lex Acilia de intercalando'' (

Latin Latin ( or ) is a classical language belonging to the Italic languages, Italic branch of the Indo-European languages. Latin was originally spoken by the Latins (Italic tribe), Latins in Latium (now known as Lazio), the lower Tiber area aroun ...

for "The Acilian Law on Intercalating") was a

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introduced by the

consul Consul (abbrev. ''cos.''; Latin plural ''consules'') was the title of one of the two chief magistrates of the Roman Republic, and subsequently also an important title under the Roman Empire. The title was used in other European city-states thro ...

M'. Acilius Glabrio and enacted in 191BC. Its content is unclear, but it dealt with intercalation in the

Roman calendar The Roman calendar was the calendar used by the Roman Kingdom and Roman Republic. Although the term is primarily used for Rome's pre-Julian calendars, it is often used inclusively of the Julian calendar established by Julius Caesar in 46&nbs ...

Context

The state of the

during this period is uncertain.

Roman mythology Roman mythology is the body of myths of ancient Rome as represented in the literature and visual arts of the Romans, and is a form of Roman folklore. "Roman mythology" may also refer to the modern study of these representations, and to th ...

traced the Republican calendar of 355 days to

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, the city's second king, and also credited him with the establishment of some kind of intercalation to keep it aligned with the

solar year A tropical year or solar year (or tropical period) is the time that the Sun takes to return to the same position in the sky – as viewed from the Earth or another celestial body of the Solar System – thus completing a full cycle of astronom ...

. Some authors even credited him with use of the 19-year

Metonic cycle The Metonic cycle or enneadecaeteris (from , from ἐννεακαίδεκα, "nineteen") is a period of almost exactly 19 years after which the lunar phases recur at the same time of the year. The recurrence is not perfect, and by precise obser ...

. There is evidence, however, that the Romans long continued their early and unattested

lunar calendar A lunar calendar is a calendar based on the monthly cycles of the Moon's phases ( synodic months, lunations), in contrast to solar calendars, whose annual cycles are based on the solar year, and lunisolar calendars, whose lunar months are br ...

even after the establishment of the

Republic A republic, based on the Latin phrase ''res publica'' ('public affair' or 'people's affair'), is a State (polity), state in which Power (social and political), political power rests with the public (people), typically through their Representat ...

Varro Marcus Terentius Varro (116–27 BCE) was a Roman polymath and a prolific author. He is regarded as ancient Rome's greatest scholar, and was described by Petrarch as "the third great light of Rome" (after Virgil and Cicero). He is sometimes call ...

cites instances of intercalation at least as early as the 5th century BC. Alternatively, intercalation is sometimes said to have begun with the

decemviri The decemviri or decemvirs (Latin for "ten men") refer to official ten-man commissions established by the Roman Republic. The most important were those of the two decemvirates, formally the decemvirate with consular power for writing laws () w ...

, who may have adopted either

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practices.. Fulvius claims the Acilian Law was the first to authorize any intercalation. The calendar seems to have been greatly out of sync with the seasons during this period, probably in part due to the exigencies of the

Second Punic War The Second Punic War (218 to 201 BC) was the second of Punic Wars, three wars fought between Ancient Carthage, Carthage and Roman Republic, Rome, the two main powers of the western Mediterranean Basin, Mediterranean in the 3rd century BC. For ...

. Two astronomical events dated by

Livy Titus Livius (; 59 BC – AD 17), known in English as Livy ( ), was a Roman historian. He wrote a monumental history of Rome and the Roman people, titled , covering the period from the earliest legends of Rome before the traditional founding i ...

show the Roman calendar was 4 months out of alignment with its Julian counterpart in 190 BC, the year after the reform, and only two months out of alignment by 168 BC.

The details of the law are uncertain, but it seems to have placed the decision whether or not to

intercalate Intercalation may refer to: *Intercalation (chemistry), insertion of a molecule (or ion) into layered solids such as graphite *Intercalation (timekeeping), insertion of a leap day, week or month into some calendar years to make the calendar follo ...

a month into the year with the

College of Pontiffs The College of Pontiffs (; see ''collegium'') was a body of the ancient Rome, ancient Roman state whose members were the highest-ranking priests of the Religion in ancient Rome, state religion. The college consisted of the ''pontifex maximus'' an ...

References

External links

The Roman Law Library, incl. ''Leges''

191 BC 2nd century BC in law Roman law 2nd century BC in the Roman Republic {{AncientRome-law-stub

Context

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See also

References

External links