the celts , ruled by warrior kings and an intellectual caste of druids ( a word which might mean oak knowledge ) , themselves lived across europe by 1000bc and even moved into areas that are a part of modern-day turkey ; they were the galatians of asia minor in the bible , to whom paul wrote his great epistle , and many celtic colonies still lived under the roman empire ; for example , the great roman poet virgil , who wrote the aeneid , was only a small part etruscan ; he was in fact a celt from cisalpine gaul .