The Cornish language revival is an ongoing process to revive the use of the Cornish language of Cornwall, United Kingdom. The revival movement started in the late 19th century as a result of antiquarian and academic interest in the language, which was already extinct, and also as a result of the Celtic revival movement. In 2009, UNESCO changed its classification of Cornish from "extinct" to "critically endangered", seen as a milestone for the revival of the language.