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
Massinissa became the founder of the Numidian kingdom; and seldom has choice or accident hit upon a man so thoroughly fitted for his post. In body sound and supple up to extreme old age; temperate and sober like an Arab; capable of enduring any fatigue, of standing on the same spot from morning to evening, and of sitting four-and-twenty hours on horseback; tried alike as a soldier and a general amidst the romantic vicissitudes of his youth as well as on the battle-fields of Spain, and not less master of the more difficult art of maintaining discipline in his numerous household and order in his dominions; with equal unscrupulousness ready to throw himself at the feet of his powerful protector, or to tread under foot his weaker neighbour; and, in addition to all this, as accurately acquainted with the circumstances of Carthage, where he was educated and had been on familiar terms in the noblest houses, as he was filled with an African bitterness of hatred towards his own and his people's oppressors, --this remarkable man became the soul of the revival of his nation, which had seemed on the point of perishing, and of whose virtues and faults he appeared as it were a living embodiment.
Fortune favoured him, as in everything, so especially in the fact, that it allowed him time for his work. He died in the ninetieth year of his age (516-605), and in the sixtieth year of his reign, retaining to the last the full possession of his bodily and mental powers, leaving behind him a son one year old and the reputation of having been the strongest man and the best and most fortunate king of his age.
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Reference address : https://www.ellopos.net/elpenor/rome/3-07-peace-hannibal-third-period.asp?pg=22