Bryan, Kathleen -- The Serpent and the Rose

Copyright page tells me this is Judith Tarr, whom I used to enjoy. This one is enjoyable too. A Europe-analogue (in which the Christianity-analogue is magic-positive, for once) is threatened by a tyrant king. Various orders of mage-monks attempt to deal with this. The language is sensuous and the medieval detail resonates (as you'd expect from Tarr).

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