Mistress of the Empire by Janny Wurts
Mara of the Acoma survives an assasination attempt but loses one of her sons. Opposed by Jiro of the Asanti and the Hamoi Tong even with her considerable talents and resources she is in a very dangerous position.

When the Assembly of Magicians prevents her from defending herself from the Traditionalists all appears to be lost. Her allies are sidelined, knowing that to defy the Assembly is the quickest way to obliteration. In the end, even the Emperor is unable to help her.
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I had forgotten how involved this story was. Very enjoyable read. (Seriously, I've upgraded the set to hardcover so I can keep them around longer.)


Shallowford