Harry Turtledove 
Krispos of Videssos [EPUB ebook] 

Against all expectations, Krispos has won the crown of Videssos. But how long could he hope to keep head and crown together? For trouble was brewing in every quarter. Civil war erupted under Petronas, the late Emperor’s uncle. A brilliant general and a canny politician, Petronas had a very personal score to settle against the upstart Krispos. And even as rebel troops took the field against the untried Emperor, outland raiders swept down from the northlands in a tide of carnage. The power stemmed from foulest sorcery, and Videssos’ wizards could not counter its evil curse. Krispos’ reign showed every sign of being brief — and very bloody…