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
Perpenna Succeeds Sertorius
The murderers thought to succeed to the heritage of the murdered. After the death of Sertorius, Perpenna, as the highest among the Roman officers of the Spanish army, laid claim to the chief command. The army submitted, but with mistrust and reluctance. However men had murmured against Sertorius in his lifetime, death reinstated the hero in his rights, and vehement was the indignation of the soldiers when, on the publication of his testament, the name of Perpenna was read forth among the heirs. A part of the soldiers, especially the Lusitanians, dispersed; the remainder had a presentiment that with the death of Sertorius their spirit and their fortune had departed.
Pompeius Puts an End to the Insurrection
Accordingly, at the first encounter with Pompeius, the wretchedly led and despondent ranks of the insurgents were utterly broken, and Perpenna, among other officers, was taken prisoner. The wretch sought to purchase his life by delivering up the correspondence of Sertorius, which would have compromised numerous men of standing in Italy; but Pompeius ordered the papers to be burnt unread, and handed him, as well as the other chiefs of the insurgents, overto the executioner.
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Reference address : https://www.ellopos.net/elpenor/rome/5-01-lepidus-sertorius.asp?pg=55