They were a tall blond dolichocephalic type which today is common in Sweden. The original Kelts looked different from most of the people who speak Keltic languages or claim Celtic heritage today. When the Kelts invaded the British Isles, they were a conquering people. Most Irish are probably more descended from the pre-Keltic peoples than from the Kelts, who were the nobles. The blond invaders were the Tuatha da Danaan, or something like that.
Irish literature depicts the heroes and nobles as being blond.
The lower classes were short and dark. I think they were called the Fir na Bog or something like that. Leprechauns may represent the dark pre-Keltic inhabitants or Finians. All rights reserved.