AGENT OF BYZANTIUM is a collection of Harry Turtledove’s Basil Argyros stories. They’re set in a timeline where Mohammed ended up a Christian bishop in Iberia (and eventual saint), instead of the founder of Islam; it’s now the 14th Century, and the Byzantine Empire is doing fine. Unfortunately for them, so are the Sassanids. Basically the stories are about technological innovations, and how an empire that’s not so much technophobic as it is cautious would deal with them. Good stuff all around.
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