I do not mean in Rome, however. I am asking what Celtic Languages existed or were created during the early years of Rome, if any existed at the time. This is for story writing purposes, specifically in creating a fictional language, but I felt it more linguistically oriented than world building.
And if many Celtic Languages existed, which would be considered the most prevalent of them at the time?
(I believe the celtic languages are Welsh, Scottish Gaelic, Irish, and Breton.)