No .. that's not the one. (I should read it, though. Need to see if my local library carries it.) I gave my set of books to someone, so can't refer to them now. I'll remember his name, though probably in the middle of sleeping!
I'll mention here someone else whose novels are well worth a read: Peter Berresford Ellis (a British historian). As he's based in historical research he can put a spin on things that many cannot.
(Now I'm blanking on someone else who wrote historical novels based on massive research, making the storylines very believable.)
On topic: I wish I were able to help with the Irish research stuff, but I have trouble finding anything there at all. So many walls. :(