Atia of the Julii
(played by Polly Walker)
Niece of Caesar, mother of Octavia and Octavian. She is snobbish, willful and cunning, sexually voracious and totally amoral. In a culture in which women are formally without any power, Atia is among the shadow rulers of Rome - women who have built powerful networks and alliances completely independent of the men's worlds while they are away for months and years on military campaigns.