Can I drop in to play pedant? The statement The form of Celtic that was to become Irish was brought to Ireland by the invading Gaels -- about 300 B.C. according to some scholars is a bit misleading. There is little or no evidence for an invasion or movement of people bringing their language to Ireland. Instead, the general consensus today is that a movement of ideas and therefore a transmission of "Celtic culture" was behind the change apparent in the material record.