"Lord of Emperors" was published in 2000. The story continues from "Sailing to Sarantium" and tells of what happens to Crispin after his arrival in the city of Sarantium. Crispin has been charged with a project to cover the interior of the dome of a grand new religious building in Sarantium with a mosaic work. The confidant of both Alixana, the empress, and of the exiled Queen Gisel of Crispin's native Batiara (modelled on the Ostrogoth queen, Amalasuntha), Crispin struggles to survive the political machinations of the era and work on his mosaic. The reader is also introduced to Rustem of Kerakek, a physician from Bassania, an eastern empire roughly analogous to Sassanid Persia, who has also journeyed to the city, finding himself entangled in political intrigue. A significant theme of the book is the interplay between the lives of the politically powerful and the interests of the ordinary people, typified by the chariot races at the hippodrome which become an all-consuming passion for the people even as the empire draws closer to war and upheaval.