developed into various daughter languages, including the Proto-Celtic language.

In Proto-Celtic ("PC"), the Proto-Indo-European ("PIE") sound *p disappeared, perhaps through an intermediate *'. It is a common point between all the Celtic languages. Examples : Latin pater "father", but Gaulish *atir / ater (atrebo, dativ plural), (Old) Irish athair / athir.

After that, languages derived from Proto-Celtic

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