Hmm - I took it to mean that "magic" was dying out, even in Rigante lands, so Feargol would have 'lost' a lot of his power as it was drawn from the land.
So he went to a "New World" across the ocean with limited technology (which appeared to be one of the factor's 'killing magic') where magic was still powerful and he could do some good and help the "primitive natives"
or, putting it very bluntly, he left Europe and went to North America circa 16th Century.
One of the down sides about Gemmell's Stormrider series is he makes his source material
far too obvious, which ruins it a little for me.
Rigante = Scots
Kaelin Ring = William Wallace
Moidart = Robert the Bruce
Jaem = Generic scots "Big Man" with a big heart - how about the ginger dude from Braveheart - he'd fit the bill
Varlish = English
You could even draw parallels for Coventers/Royalists being the Roundheads/Royalists from the English civil wars and the Redeemers being the Puritans which held power briefly afterwards.
Of course, that would make Winter Kay, Cromwell which isn't a fair comparison.
I liked his one-offs, like "Echoes of the Great Song", as they have a slice of originality about them, although to be honest, as much as I like David Gemmell's books, he's ripped off History to provide base material from day one.
Sippstrassi (sp?) is probably his "unique" invention, but even that can be traced back to the myth of the Philosopher's Stone.