In the winter of 304 c.e., the Roman Empire is divided by Emperor Diocletian into four separate parts. Individual power struggles and manipulations make the once-stable empire a breeding ground for corruption. In the midst of this, Aelius Spartianus, a high-ranking officer and Diocletian's official historian, is sent to Trier with a sensitive message for Emperor Constantius. En route, he receives a letter from a former enemy telling him of a strange...