I think the fic you're thinking of is Voltaire's "Debt of Honor" fic. He isn't a "super-awesome" wyvern rider but he is technically a wyvern knight from Bern (and a noble and martial artist). The writing is decent but his tactician has pretty quickly become a Gary Stu, particularly in the later chapters.
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Date: 2011-09-22 06:21 pm (UTC)