There are 3 books in the Riverside series. The newest book is The Fall of The Kings which came out in 2003.

1
Swordspoint

Book cover of Swordspoint
On the treacherous streets of Riverside, a man lives and dies by the sword. Even the nobles on the Hill turn to duels to settle their disputes. Within this elite, dangerous world, Richard St Vier is the undisputed master, as skilled as he is ruthless- until a death by the…
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2
The Privilege of the Sword

Book cover of The Privilege of the Sword
"Unholy fun, and wholly fun ...an elegant riposte, dazzlingly executed."-Gregory Maguire "Spiced with humor and spot-on period detail."-Library Journal (starred review) Sent to live with her uncle, Katherine imagines a rich and luxurious life. Her dreams evaporate when she discovers her uncle wants her to be something never before seen:…

3
The Fall of The Kings

By Ellen Kushner , Delia Sherman,

Book cover of The Fall of The Kings

Generations ago the last king fell, taking with him the final truths about a race of wizards who ruled at his side. But the blood of the kings runs deep in the land and its people, waiting for the coming together of two unusual men. Theron Campion is heir to…