Now according to the Roman mode, such a term as Trev-alyn would have been changed into Trev-iri, the designation actually given to the Celts of “Treves,” &c. The following are analogous examples: There is a tribe of Brig-antes in Yorkshire, another in Ireland, and a third in the North-east of Spain. Many unsuccessful attempts have been made to show that these distant Celtic tribes must have been scions of the same tribe. A much simpler explanation may be given. By referring to the Roman maps the reader will find a word, “Briga,” in such general use as part of the names of towns as to leave no reasonable doubt that it must have been, like Tre, a Celtic name for a town—now obsolete. Thus in Spain we have, Laco-briga, Meido-briga, Ara-briga, Tala-brica, Augusto-briga, &c. Now the analogous instances already noticed suffice to point out that the occurrence of Brig-antes as a Roman name of Tribes in three Celtic countries, is a natural result of the frequent occurrence of Briga as the first part of the names of Celtic places. The “Allo-bryg-es.” The name of this warlike tribe, the Celtic inhabitants of Savoy, has also been the source of perplexity, which may be removed in the same manner. This tribe had a town, called by the Romans “Brig-icum,” which was said to be “the only one they had.”(55) Now Allo-Bryga may reasonably be identified with Alpo-Briga, the Town of the Alps (Briga being clearly the common base of “Allo-bryg-es,” and “Brig-icum.”) The names of Celtic communities, as they appear on the Roman Maps, may, I conceive, be proved to have been descriptive of the most prominent natural features of the regions they inhabited, and not of their lineage or descent, as seems to have been often supposed. Thus we have the Mor-ini in Belgium, and the Ar-mor-ici in Gaul on the Sea; we have the Sen-ones on the Seine, the Tamar-ici on the Tamar-is, in Hispania, &c. In the Mountainous regions it will be observed that the names of tribes are derived from the Mountains. In the flat countries they take their names from Rivers or the confluence of Rivers. In the same manner it is highly deserving of remark, that the names of the different French Departments have been derived from precisely the same natural features. Thus in the Hilly countries we have the Departments of the High Alps, “Hautes Alpes;” of the Low Alps, “Basses Alpes;” in the Champaign countries the Departments are named from the Rivers; such as the Seine, the Marne, and the Somme, &c. Many of these French names are literally equivalent to translations of the ancient Gaulish names, as interpreted by means of the Welsh and Irish languages. It is impossible to conceive a more perfect verification of the accuracy of these interpretations!