Replies

Re; the Tuatha de Danaan being somehow related to the tribe of Dan -- we must beware of jumping to conclusions just because the name of one group when translated into our language sounds similar to the name of another group when translated into our language. Even the pronounciation of the two words is different -- a sharp "a" sound in Dan and a long drawn "aaa" in Daaanan.

The Celts are too old to be descended from the tribes of Israel -- too old and too different (linguistically, ethnically, physically, culturally, religiously etc)

The problem with the entire 'lost tribes' thing is that we mix Biblical prophecy with hard nosed facts. It's ok if we take one or the other, but most proponents of the lost tribes theory jump between the two in a most confusing manner like oh, it doesn't work out in that so let's use that.

With regards to Fomorians being a Black race, I'd say "there's no such thing as a black race" -- there were speculations that the picts (pictarii or painted ones) were not "white" either, but these again are speculations

These groups COULD have been a darker skinned people, but I would doubt they were Negroid. Why? Because some amount of their genes would have survived and you would have had the Irish or Scots with some Negroid features (maybe not dark skin but perhaps broader noses?). Could they have been brown skinned people from North Africa/the Middle East? Possibly.