Taliesin

Recently I have been reading a novel by Stephen Lawhead, it's called Taliesin it's the first in a series called the pendragon cycle which is about king artur except it set is in roman occupied britain instead of the usual middle ages setting. This novel however does not have Arthur in it instead it is about an Atlantean princess living in Atlantis just a bit before it is destroyed this princess eventually becomes the lady of the lake

Also there is a british tribesman named Taliesin who I think is Arthurs ancestor the tribesman is trying to defend britain fom the barbarian invaders since the roman empire is in it's final year