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
It may readily be conceived that such a priesthood attempted to usurp, as it partially did usurp, the secular government; where the annual monarchy subsisted, it conducted the elections in the event of an interregnum; it successfully laid claim to the right of excluding individuals and whole communities from religious, and consequently also from civil, society; it was careful to draw to itself the most important civil causes, especially processes as to boundaries and inheritance; on the ground, apparently, of its right to exclude from the community, and perhaps also of the national custom that criminals should be by preference taken for the usual human sacrifices, it developed an extensive priestly criminal jurisdiction, which was co-ordinate with that of the kings and vergobrets; it even claimed the right of deciding on war and peace.
The Gauls were not far removed from an ecclesiastical state with its pope and councils, its immunities, interdicts, and spiritual courts; only this ecclesiastical state did not, like that of recent times, stand aloof from the nations, but was on the contrary pre-eminently national.
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Reference address : https://www.ellopos.net/elpenor/rome/5-07-subjugation-west.asp?pg=33