<prompt> Passage: Linguists realized from the 17th century onwards that the language spoken by these people, the Goidelic languages, was a branch of the Celtic languages. This is usually explained as a result of invasions by Celts from the continent. Hata hivyo, utafiti mwingine umeonyesha kuwa utamaduni huo ulikua hatua kwa hatua na kuendelea, na kwamba kuanzishwa kwa lugha ya Celtic na mambo ya utamaduni wa Celtic inaweza kuwa matokeo ya kubadilishana kitamaduni na vikundi vya Celtic kusini magharibi mwa Ulaya kutoka Neolithic hadi Umri wa Shaba. Nadharia kwamba wenyeji wa Mwisho wa Umri wa Shaba wamechukua hatua kwa hatua ushawishi wa Celtic tangu wakati huo umeungwa mkono na utafiti wa hivi karibuni wa maumbile. Warumi walitaja Ireland kama Scotia mnamo 500 CE na baadaye Hibernia. Ptolemy, 100 CE, alirekodi katika jiografia ya Ireland na makabila ya Ireland.  <response>: Ptolemy 