Look into the solutrean migration from Atlantis, Robert sepher does lots on this.

I’m from Ireland (Connacht) the most westerly part of Europe, closest to where Atlantis was. The last migration occurred 3600 years ago and came in waves before this.

This is where the red haired gene and Rh- originated. Many who don’t have red hair or Rh- are carriers of the recessive gene. It’s r1b haplogroup.

The original inhabitants of Ireland were the Tuatha de Danaan who landed in Connacht. They fought the firbolg and formorians (all of who were red haired and what you would call giants). The Milesian celts then took over last of all and they were normal folks if you like. The two populations interbred.

So the original red haired folks are also what we refer to as Annunaki and they completed the megaliths there. King Arthur was also a descendant..