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Linguists start compiling first ever complete dictionary of ancient Celtic

It is not likely to be a hefty volume because the vast majority of the material has been lost in the mists of time. But the remnants of a language spoken in parts of the UK and Ireland 2,000 years ago are being collected for what is being billed as the first complete dictionary of ancient Celtic.

Sources for the dictionary will range from Julius Caesar's account of his conquest of parts of northern Europe to ancient memorial stones.

Dr Simon Rodway, a senior lecturer in the department of Welsh and Celtic studies at Aberystwyth, said it was exciting to be involved in compiling the first dictionary of its kind.

He said: “These disparate sources have never before been brought together in a way that offers such an insight into the nature of Celtic languages spoken in these islands at the dawn of the historical period.

“The picture of the linguistic landscape of Britain and Ireland will be of interest not only to linguists but to historians, archaeologists and archaeogeneticists.”

The team compiling the dictionary say that while modern Celtic languages are often different from each other, similarities can be seen between words.

Rodway said: “With the exception of a very small number of inscriptions from Roman Britain in Celtic languages, we're dependent on documents that are written either in Latin or Greek, but which contain names of places, ethnic groups or individuals that we can say are Celtic.

“People have studied, place names before and a few inscriptions but we're going to try and get everything together and see what patterns emerge.”

He said the bulk of the material would come from the Roman period in Britain, from the first to the fourth centuries AD, and from the middle of the second century onwards in Ireland. Another source is inscriptions on stones in places such as Cornwall and Ireland that use the Ogham alphabet, a system of straight lines designed to be carved on to stone, metal, bone or wood.

Adapted from https://www.theguardian.com/science/2025/dec/08/linguists-start-compiling-first-ever-complete-dictionary-of-ancient-celtic