Book
Masters of Rome
Book 2 in the Rise of Emperors series.
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Constantine and Maxentius emerge as rulers of different parts of a fractured empire, each surrounded by advisers, rivals and military threats. Their old friendship weakens as religious policy, family tragedy and the unstable succession left by the Tetrarchy force them to defend their own authority.
Misunderstanding becomes open hostility, and compromise appears increasingly dangerous to both men. Armies gather as the former companions turn into competing emperors, making control of Italy and Rome the prize in a conflict that can no longer be resolved through negotiation.