The Tetrarchs

Three hundred years after Christ's birth, Christianity struggles to survive in the unforgiving environment of the Roman Empire. Four powerful men, the Tetrarchs, administer the sprawling empire, maintaining control through a mix of political cunning and military might.
A generation later, one emperor rules in the Tetrarch's place-an emperor who will raise Christianity from the catacombs of Rome to the official religion of the empire.
After the son of wealthy Roman governor Sabinius dies during the siege of Alexandria, his widow and son, Paul, mysteriously vanish, along with their servants.
Assigned to locate and retrieve Sabinius's grandson is a young centurion named Constantine. Rescuing a tortured and mutilated Paul from slavers, Constantine unwittingly provides the young man with a front-row seat to a pivotal point in Western politics and religion.
A fast-paced historical novel, The Tetrarchs combines faith, political schemes, and mystery to tell Constantine's tale-a tale of a remarkable man who cast off centuries of tradition to embrace an inspiring new religion.