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 Celts of Asia Minor
Of greater importance for the general relations was the Celtic state in the interior of Asia Minor. There, intermediate between Bithynia, Paphlagonia, Cappadocia, and Phrygia, three Celtic tribes --the Tolistoagii, the Tectosages, and Trocmi--had settled, without abandoning either their native language and manners or their constitution and their trade as freebooters.
The twelve tetrarchs, one of whom was appointed to preside over each of the four cantons in each of the three tribes, formed, with their council of 300 men, the supreme authority of the nation, and assembled at the "holy place" (-Drunemetum-), especially for the pronouncing of capital sentences. Singular as this cantonal constitution of the Celts appeared to the Asiatics, equally strange seemed to them the adventurous and marauding habits of the northern intruders, who on the one hand furnished their unwarlike neighbours with mercenaries for every war, and on the other plundered on their own account or levied contributions from the surrounding districts.
These rude but vigorous barbarians were the general terror of the effeminate surrounding nations, and even of the great-kings of Asia themselves, who, after several Asiatic armies had been destroyed by the Celts and king Antiochus I. Soter had even lost his life in conflict with them (493), agreed at last to pay them tribute.
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Reference address : https://www.ellopos.net/elpenor/rome/3-08-second-macedonian-war.asp?pg=9