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
Attempt at an Aristocratic Restoration - Attack on Caesar's Laws
These repeated repulses which Pompeius met with in the senate and, what was worse, had to acquiesce in without retaliation, were naturally regarded--come from what side they would--by the public at large as so many victories of the republicans and defeats of the regents generally; the tide of republican opposition was accordingly always on the increase. Already the elections for 698 had gone but partially according to the minds of the dynasts; Caesar's candidates for the praetorship, Publius Vatinius and Gaius Alfius, had failed, while two decided adherents of the fallen government, Gnaeus Lentulus Marcellinus and Gnaeus Domitius Calvinus, had been elected, the former as consul, the latter as praetor.
But for 699 there even appeared as candidate for the consulship Lucius Domitius Ahenobarbus, whose election it was difficult to prevent owing to his influence in the capital and his colossal wealth, and who, it was sufficiently well known, would not be content with a concealed opposition. The comitia thus rebelled; and the senate chimed in. It solemnly deliberated over an opinion, which Etruscan soothsayers of acknowledged wisdom had furnished respecting certain signs and wonders at its special request. The celestial revelation announced that through the dissension of the upper classes the whole power over the army and treasure threatened to pass to one ruler, and the state to incur loss of freedom--it seemed that the gods pointed primarily at the proposal of Gaius Messius.
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Reference address : https://www.ellopos.net/elpenor/rome/5-08-pompeius-caesar.asp?pg=22