Instruct: Classify a given Amazon review into positive or negative sentiment.
Query: Read with caution

White's novel is testimony to his exceptional writing skills, but White fictionalizes history in ways that can be misleading. The great irony of this book is that, in spite of White's diatribes against the Celts, Arthur himself was of Celtic origin. To learn the real story behind the Arthur legend, I recommend Ashe's book The Discovery of King Arthur. If Arthur really was Riothamus, this defeats the political agenda of White's novel.