While the language is named after the tribe of the Lepontii, which occupied portions of ancient Rhaetia, specifically an Alpine area straddling modern Switzerland and Italy and bordering Cisalpine Gaul, the term is currently used by some Celticists (e.g. Eska 1998) to apply to all Celtic dialects of ancient Italy. This usage is disputed by those who continue to view the Lepontii as one of several indigenous pre-Roman tribes of the Alps, quite distinct from the Gauls who invaded the plains of Northern Italy in historical times.