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
Assassination of Aemilianus
The reform-party was deeply indignant. Even men like Publius Mucius and Quintus Metellus disapproved of the intervention of Scipio. Other circles were not content with expressing disapproval. Scipio had announced for one of the following days an address respecting the relations of the Latins; on the morning of that day he was found dead in his bed. He was but fifty-six years of age, and in full health and vigour; he had spoken in public the day before, and then in the evening had retired earlier than usual to his bedchamber with a view to prepare the outline of his speech for the following day.
That he had been the victim of a political assassination, cannot be doubted; he himself shortly before had publicly mentioned the plots formed to murder him. What assassin's hand had during the night slain the first statesman and the first general of his age, was never discovered; and it does not become history either to repeat the reports handed down from the contemporary gossip of the city, or to set about the childish attempt to ascertain the truth out of such materials. This much only is clear, that the instigator of the deed must have belonged to the Gracchan party; the assassination of Scipio was the democratic reply to the aristocratic massacre at the temple of Fidelity.
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Reference address : https://www.ellopos.net/elpenor/rome/4-03-revolution-gaius-gracchus.asp?pg=7