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
Memoirs and Speeches
The subordinate, more individual and ephemeral, species of historical literature--memoirs, letters, and speeches--were strongly represented also, at least as respects quantity. The first statesmen of Rome already recorded in person their experiences: such as Marcus Scaurus (consul in 639), Publius Rufus (consul in 649), Quintus Catulus (consul in 652), and even the regent Sulla; but none of these productions seem to have been of importance for literature otherwise than by the substance of their contents.
The collection of letters of Cornelia, the mother of the Gracchi, was remarkable partly for the classical purity of the language and the high spirit of the writer, partly as the first correspondence published in Rome, and as the first literary production of a Roman lady. The literature of speeches preserved at this period the stamp impressed on it by Cato; advocates' pleadings were not yet looked on as literary productions, and such speeches as were published were political pamphlets.
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Reference address : https://www.ellopos.net/elpenor/rome/4-13-literature-art.asp?pg=49