Please note that Mommsen uses the AUC chronology (Ab Urbe Condita), i.e. from the founding of the City of Rome. You can use this reference table to have the B.C. dates
From: The History of Rome, by Theodor Mommsen
Translated with the sanction of the author by William Purdie Dickson
The Classicists and the Moderns
The literary tendency of this age was varied and could not be otherwise, for the age itself was divided between the old and the new modes. The same tendencies which came into conflict on the field of politics, the national-Italian tendency of the conservatives, the Graeco-Italian or, if the term be preferred, cosmopolitan tendency of the new monarchy, fought their battles also on the field of literature. The former attached itself to the older Latin literature, which in the theatre, in the school, and in erudite research assumed more and more the character of classical. With less taste and stronger party tendencies than the Scipionic epoch showed, Ennius, Pacuvius, and especially Plautus were now exalted to the skies.
The leaves of the Sibyl rose in price, the fewer they became; the relatively greater nationality and relatively greater productiveness of the poets of the sixth century were never more vividly felt than in this epoch of thoroughly developed Epigonism, which in literature as decidedly as in politics looked up to the century of the Hannibalic warriors as to the golden age that had now unhappily passed away beyond recall. No doubt there was in this admiration of the old classics no small portion of the same hollowness and hypocrisy which are characteristic of the conservatism of this age in general; and here too there was no want of trimmers.
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Reference address : https://www.ellopos.net/elpenor/rome/5-12-religion-culture-literature-art.asp?pg=26