In "Le Roi du Monde" Guénon mentions on page 80 that Erin (anglicised
as Ireland) was once given to Thule or Orgyia. Erin has been
associated with Iran according to the French Assyriologist, François
Lenormant.
Without getting involved in the genetic speculation of ancient Irish
peoples, it could be safe to say, that one time they were Aryan in all
senses of the word. Modern scholars claim that the La Tène culture
drifted in from the West as an Aryan stock from so called Iranian
crib. Nonetheless Evola, if I am correct made the claim that it was a
North-East descent to the South-West. This would make sense on Inis
Morr one of the Aran Islands of the coast of Ireland lies Dún Aengus,
a stunning fort dating back to probably 4000B.C, the rest of the
Hyperborean spirit can be followed up in "Mystery of the Grail". Also
with reference to the Starry Plough it was the "Great Bear" in
Ireland, before it was co-opted as a flag by the Marxist Citizen Army
around the time of the Easter Rising.