Michael Moorcock's Eternal Champion books --- very influential on D&D.
Steven Brust's Dragaera books were actually based on a role playing game campaign.
Poul Anderson's _The Broken Sword_ and _The Merman's Children_ make a nice pairing.
Judith Tarr's _The Hound and the Falcon_, _Alamut_ and _The Dagger and the Cross_
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