I guess the lesson here is, sometimes, you really can (or should) judge a book by its cover. I saw this on a freebie fantasy listing, and accessing it through Kindle, came across no front cover, but did encounter a map of ancient Wales and a glossary that indicated a complex plot structure with many varied characters with difficult names. It looked well thought out and well researched, so I decided to give it a go.
It was well researched. The author had an impressive vocabulary and an admirable understanding of social, cultural, and political life in Wales following the Crusades as well as a deep (and at times, poetic) appreciation of pre-Christian nature religions, alchemy, folk myths and traditions, and perceptions and practices of magic. The downside for me was, this was not historical fiction alone, or even sword and sorcery fantasy mixed with historical fiction alone: it turned out to be, foremost, historical romance. There was enough of the other components to keep me reading to see how things would be resolved, but I don't think I'll pursue this trilogy any further, as the undying and ultimate triumph of the love of the hero and the heroine is not what I was looking for as the major focus of the book. The balance went too far that way for my interests--but for some woman who wants her romance fiction embedded in such an engaging mix of sword, sorcery, secret older religions,and Celtic history, this would, I should think, be a very satisfying read.