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
External Relations - Celts and Iberians
Such was the internal condition of the Celtic nation. It remains that we set forth their external relations with their neighbours, and describe the part which they sustained at this moment in the mighty rival race and rival struggle of the nations, in which it is everywhere still more difficult to maintain than to acquire. Along the Pyrenees the relations of the peoples had for long been peaceably settled, and the times had long gone by when the Celts there pressed hard on, and to some extent supplanted, the Iberian, that is, the Basque, original population.
The valleys of the Pyrenees as well as the mountains of Bearn and Gascony, and also the coast- steppes to the south of the Garonne, were at the time of Caesar in the undisputed possession of the Aquitani, a great number of small tribes of Iberian descent, coming little into contact with each other and still less with the outer world; in this quarter only the mouth of the Garonne with the important port of Burdigala (Bordeaux) was in the hands of a Celtic tribe, the Bituriges-Vivisci.
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Reference address : https://www.ellopos.net/elpenor/rome/5-07-subjugation-west.asp?pg=43