Rhaetian language
Rhaetian or Rhaetic (Raetic) is an ancient language spoken in the ancient region of Rhaetia in the Eastern Alps in pre-Roman and Roman times. It is documented by a limited number of short inscriptions (found through Northern Italy and Western Austria) in two variants of the Etruscan alphabet. Its linguistic categorization is not clearly established, and it presents a confusing mixture of what appear to be Etruscan, Indo-European, and uncertain other elements.
The ancient Rhaetic language is not the same as one of the modern Romance languages of the same Alpine region, known as Rhaeto-Romance—although both are sometimes referred to as "Rhaetian".
Classification
The most credible theories are that Rhaetic was:
a member — along with Etruscan — of a proposed Tyrrhenian language family by German linguist Helmut Rix, possibly influenced by neighboring Indo-European languages. Several recent works support this theory.
an Indo-European language, with links to Illyrian and Celtic