Fun-fact. The Keltoi never made it to Ireland. Gaelic Ireland, which is over 2,000 years in the making, is unconnected from the European Keltoi inhabiting large areas of Southern France, Austria, Germany and the Balkans. Gaelic leaders didn't identify as "Celtic" but as Gaels or Gaelic, delivering Gaelige, the language of the Gaels. There is no "Celtic" department in the Irish National History Museum, but there is a substantial Gaelic one.