I first read this from the library many years ago, and loved it and bought it in paperback. I have re-read it many times, and I am happy to see it reissued for my copy is falling apart. The world of Kyrannon is realistic and well imagined and described, and the characters varied and interesting. The theme is an old one but always important--how power corrupts, and how unjust power must be resisted. The book is honest about the cost of resistance, but leaves one feeling uplisted. It is a life-affirming read.
This is a moving and delightful fantasy. I also recommend "The Seekers of Shar-nun" which is set in a different part of the same world. I recommend all of her books, in fact.