The Cornish language revival (Cornish: dasserghyans Kernowek, lit. ''resurrection of Cornish'') is an ongoing process to revive the use of the Cornish language of Cornwall, England. The Cornish language's disappearance began to hasten during the 13th century, but its decline began with the spread of Old English in the 5th and 6th centuries.[1] The last reported person to have full knowledge of a traditional form of Cornish, John Davey, died in 1891. 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.