If you like this kind of content, I'm really enjoying the latest season of the Tides of History podcast. He's focused on prehistory in quite a compelling way: https://wondery.com/shows/tides-of-history/
The Irish have always been white. Ireland isn't old enough for them to have been anything else.
This article is about the Neolithic, dark-skinned people who lived in Europe as hunter-gatherers before the rise of agriculture and their replacement by the Indo-Europeans from Anatolia, and how their legacy may be preserved in Irish folklore.