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
The original simple valour was no more; the military courage based on higher morality and judicious organization, which comes in the train of increased civilization, had only made its appearance in a very stunted form among the knights. Barbarism in the strict sense was doubtless outlived; the times had gone by, when in Gaul the fat haunch was assigned to the bravest of the guests, but each of his fellow-guests who thought himself offended thereby was at liberty to challenge the receiver on that score to combat, and when the most faithful retainers of a deceased chief were burnt along with him.
But human sacrifices still continued, and the maxim of law, that torture was inadmissible in the case of the free man but allowable in that of the free woman as well as of slaves, throws a far from pleasing light on the position which the female sex held among the Celts even in their period of culture. The Celts had lost the advantages which specially belong to the primitive epoch of nations, but had not acquired those which civilization brings with it when it intimately and thoroughly pervades a people.
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Reference address : https://www.ellopos.net/elpenor/rome/5-07-subjugation-west.asp?pg=42