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
Nasica, against whom above all
others the multitude breathed vengeance, and who had at least the
courage openly to avow his deed before the people and to defend it,
was under honourable pretexts despatched to Asia, and soon afterwards
(624) invested, during his absence, with the office of Pontifex
Maximus. Nor did the moderate party dissociate themselves from these
proceedings of their colleagues.
Gaius Laelius bore a part in the
investigations adverse to the partisans of Gracchus; Publius Scaevola,
who had attempted to prevent the murder, afterwards defended it in the
senate; when Scipio Aemilianus, after his return from Spain (622), was
challenged publicly to declare whether he did or did not approve the
killing of his brother-in-law, he gave the at least ambiguous reply
that, so far as Tiberius had aspired to the crown, he had been
justly put to death.