The Imperial Army on the Rhine has been wiped out and Tiberius sent to avenge the defeat, followed later by Germanicus. Livia has discredited Postumus, who has been banished. Augustus has been feeling unwell, but is avoiding suspicions of poisoning by eating figs from his own garden.

As Augustus learned of Livia's plot against Postumus, she took action which resulted in Tiberius becoming emperor. The situation in the East now threatens Tiberius's position.

With Tiberius retired to Capri, Sejanus plans to tighten his grip on Rome and divorces his wife so he can marry Livilla. But he also has powerful enemies and his attempts to consolidate power set in motion a bloody chain of events.

Claudius has high hopes of a return to a Republic when Caligula insanely proclaims himself a god and his sister a goddess... but Rome officially accepts his divinity.