The Celtic languages are a group of related languages descended from Proto-Celtic. They form a branch of the Indo-European language family. The term "Celtic" was first used to describe this language group by Edward Lhuyd in 1707, following Paul-Yves Pezron, who made the explicit link between the Celts described by classical writers and the Welsh and Breton languages.
The second of the four Botorrita plaques. The third plaque is the longest text discovered in any ancient Celtic language. However, this plaque is inscribed in Latin script.