Tiberius, Portia's Uncle, is the Roman Governor of the Egyptian city of Alexandria. A skilled politician, Tiberius carries out his duties with cold, ruthless efficiency, whether it's collecting taxes, putting down rebellions or capturing rebels on the run.

Tiberius's coldness carries over into his relationship with Portia. Though he is her guardian, he shows little interest in her or her friends. As a result, Portia drifts away from him - and all things Roman.

At the end of Series One, Tiberius's evil and sneaky methods pay off and he is given a prize assignment: helping to lead the siege of Jerusalem. After Jerusalem falls, Tiberius takes yet another step up the ladder - a job as prefect in Rome.

A vain man, Tiberius is seldom without his precious hand mirror.