The Black Jewels TrilogyAnne Bishop2003

Seven hundred years ago, a Black Widow witch saw an ancient prophecy come to life in her web of dreams and visions.
Now the Dark Kingdom readies itself for the arrival of its Queen, a Witch who will wield more power than even the High Lord of Hell himself. But she is still young, still open to influence--and corruption.
Whoever controls the Queen controls the darkness. Three men--sworn enemies--know this. And they know the power that hides behind the blue eyes of an innocent young girl. And so begins a ruthless game of politics and intrigue, magic and betrayal, where the weapons are hate and love--and the prize could be terrible beyond imagining...