10. Galatian Language
Extinct: 6th Century
Galatian language was spoken on the territory of today’s Turkey, and it was used by Galatians. It is a Celtic language that belongs to the family of Indo-European languages, and the most interesting thing and probably one of the reasons why the language became extinct is the fact that Galatians were mostly bilingual, speaking Greek besides their own language. It has been noted that they spoke it even in the 1st century as well, since there were letters from Paul the Apostle written to Galatians in Greek, which means that they probably struggled a lot to preserve their own language. Eventually, they completely assimilated, to the point of losing the language in the 6th century.