Machiavelli: A Biography, by Miles J. Unger
The End of Byzantium, by Jonathan Harris
Legions of Rome: The Definitive History of Every Imperial Roman Legion, by Stephen Dando-Collins
Yes, I am a geek. Having the history of EVERY SINGLE ROMAN LEGION at my fingertips is beyond cool, but Dando-Collins' book is also a chronological compendium of the battles of the Empire. With the battles of the Republic covered by John Drogo Montagu's excellent work, Battles of the Greek & Roman Worlds: A Chronological Compendium of 667 Battles to 31 BB From the Historians of the Ancient World, I figure I'm covered.