More links for later reading:
A lot of dark age history can be found under "history of religion"
Scholar Phillip Jenkins has an article on Ninias/Finnian here
and then there is the DNA project
and For What they were blog has an article on lactose intolerance.
trivia question: Where else can you find folks able to drink milk? One royal family in Uganda got all the milk and can digest it fine.
The Masai, who are cattle herders, drink cow's blood mixed with milk.
But the Bantu I worked with (the Mashona) said you would get sick if you drank it before it was "ripe" (i.e. buttermilk).
Here in Asia, they are pushing milk to help post toddlers grow...wonder if drinking milk stops the shut down of the gene, or maybe it's because there are so many metzisos.