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
There spoke, above all, the energetic and consistent statesman, who had now for nine-and-twenty years defended the cause of freedom in good and evil times; who had braved for it the daggers of assassins and the executioners of the aristocracy, the swords of the Germans and the waves of the unknown ocean, without ever yielding or wavering; who had torn to pieces the Sullan constitution, had overthrown the rule of the senate, and had furnished the defenceless and unarmed democracy with protection and with arms by means of the struggle beyond the Alps.
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Reference address : https://www.ellopos.net/elpenor/rome/5-09-crassus-joint-rulers.asp?pg=56