https://www.aislingmagazine.com/aislingmagazine/articles/TAM24/TheFive.html

Irish Mythology has no creation myth which explains how things came into being. The world, or more specifically, Ireland, was always there. The Mythology states that, before the Celts, there were five waves of invaders. Each had a profound effect on the land.

By Steve Blamires
Five successive groups of invaders are said to have arrived in Ireland before the present day Gaels arrived. The first three groups are known by the names of their respective leaders and the last two by the names of the races involved.These five invaders were:

Cessair
Partholon
Nemed
The Fir Bolg
The Tuatha De Danann

The first of these Cessair was a woman and she arrived with her mainly female companions before the Biblical Flood. She was said to be a grand-daughter of Noah and he, with his inside information, warned her of what God had up his sleeve for the wicked peoples of this world.She fled to Ireland because, "She thought it probable that a place where people had never come before, and where no evil or sin had been committed, and which was free from the world's reptiles and monsters, that place would be free from the Flood."

She arrived forty days before the deluge but two of her three ships were wrecked and she eventually came ashore at Corca Dhuibhne which is the Dingle Peninsula in Co. Kerry. The total crew of the ship that survived was fifty women and three men. These men were Cessair's father Bith, son of Noah; Ladra the pilot of the ship; and Fionntán. They divided the women amongst the men and amongst Fionntán's women was Cessair herself. The other two men soon died and Fionntán, horrified at the prospect of having to see to the fifty women on his own, fled. Cessair consequently died of a broken heart and soon after all the other women died too, leaving Fionntán all alone in this new country.

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Weird. They mention the Fomorians (The 'giants' of Ireland) in the post, but they aren't on the list of invaders. In other myths, the Tuatha de Danann who defeated the Formorians allegedly landed on Eire on Beltaine (May 1), but from where? Water or sky?

https://www.tota.world/article/474/

It is said the Milesians usurped the Tuatha. I don't theenk so. I think the Tuatha went 'underground', finding the human race a lost cause if there's any truth to these stories. How could mere mortal flotsam defeat something so advanced? Me thinks the Tuatha are interdimensional, and not gone to those who acknowledge them. . .in a good way. (My personal belief. Hey! I'm a Pantheist Pagan with philosophically Cathar leanings.)

If there ain't no truth to the myths, the other theory is the Irish (and Nordics) are descendants of the Scythians, due to genetic traits of light hair and eyes, but that's up in the air too. I WANT MY AKASHIC LIBRARY CARD!

Can't win in the realm of Maya (Illusion).