In 1967 the Gorsedd of Cornwall (Gorsedh Kernow) and the Federation of Old Cornwall Societies established Kesva an Taves Kernewek (The Cornish Language Board) whose aim was to promote the study and use of Cornish. In 1979 Kevsa an Taves Kernewek launched Kowethas an Yeth Kernewek (The Cornish Language Fellowship) to further the development of the language and to promote activities in Cornish for the benefit of the ever increasing number of people who wished to learn it and in particular who wished to use Cornish in everyday life. Following the successful growth of Kowethas, in 1985 the two bodies formally separated but continue to work in the closest harmony for the benefit of the Cornish Language.

In 2010 An Kylgh Kernewek came under the umbrella of the Kowethas.