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
Surrender and Execution of Jugurtha
Jugurtha was sacrificed. Under the pretext that all his requests were to be granted, he was allured by his own father-in-law into an ambush, his attendants were killed, and he himself was taken prisoner. The great traitor thus fell by the treachery of his nearest relatives. Lucius Sulla brought the crafty and restless African in chains along with his children to the Roman headquarters; and the war which had lasted for seven years was at an end. The victory was primarily associated with the name of Marius.
King Jugurtha in royal robes and in chains, along with his two sons, preceded the triumphal chariot of the victor, when he entered Rome on the 1st of January 650: by his orders the son of the desert perished a few days afterwards in the subterranean city-prison, the old -tullianum- at the Capitol-- the "bath of ice," as the African called it, when he crossed the threshold in order either to be strangled or to perish from cold and hunger there.
But it could not be denied that Marius had the least important share in the actual successes: the conquest of Numidia up to the edge of the desert was the work of Metellus, the capture of Jugurtha was the work of Sulla, and between the two Marius played a part somewhat compromising the dignity of an ambitious upstart.
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Reference address : https://www.ellopos.net/elpenor/rome/4-04-rule-restoration.asp?pg=58