Michael Psellus 
The Chronographia [EPUB ebook] 

A history of the Byzantine emperors during the century leading up to Psellos’ own time. It covers the reigns of fourteen emperors and empresses, beginning with the almost 50-year-long reign of Basil II, the ‘Bulgar-Slayer’ (976–1025), and ending some time during the reign of Michael VII Doukas (1071–1078).