The problem is that the translation of that sentence is very bad. It is totally unidiomatic in English. I would render it "...one inhabited by the Belgae, anoth

The problem is that the translation of that sentence is very bad. It is totally unidiomatic in English. I would render it "...one inhabited by the Belgae, another inhabited by the Aquitani, and the third inhabited by those who in their in their own language are called Celts...".