Looking for a book

Hi folks

I am looking for a book that I read over 10 years ago. It's about a realm ruled by immortal princes, the Faeren (Elves), I think, (pied piper may have been one of this race). At the moment its divided because some of them have been banished here (or a Medieval Earth) for rebelling against the King who is the twin brother to the rebel lord. They hunt a white deer that is also immortal across this realm and ours for sport. Anyway the two brothers fall for the heroine of the story. Eventually one of them (the good one) takes her back to his realm as his queen.

I hope that makes sense because that's all I can remember. It must have been a good book for me to hanker after it so bad.

Please help I would love to read it again.

Sydney Moya