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Which languages are included in Celtic literature?

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An overview of the Irish language — Celtic literature Britannica editor Jeff Wallenfeldt provides an overview of the Irish language.

Celtic literature encompasses a body of writings composed in the Goidelic and Brythonic branches of the Celtic languages. Specifically, it includes works written in the following languages:

Goidelic: Irish, Scottish Gaelic, and Manx.12
Brythonic: Welsh, Breton, and Cornish.12

It is important to note that this classification refers to literature written in these specific Celtic languages. Writings by Irish, Scottish, or Welsh authors in English, or works by Breton authors in French, are categorized under their respective national literatures rather than Celtic literature.1