|Gaius Julius Posca|
|First appearance||The Stolen Eagle|
|Last appearance||De Patre Vostro (About Your Father)|
|Profession|| Former Slave|
|Relationships|| Jocasta (Wife)|
(Former Dominus, deceased)
(Former Employer, deceased)
Starting out as a close advisor to Caesar, as the series progresses he becomes a political player himself. It is shown that despite the fixed marriage he cares about his young wife, perhaps in small part to having helped cause the death of her family.
Posca is present with Caesar throughout the Gallic Wars.
Posca awakens and finds Caesar's body in the senate house, crying solemnly over his death. Later, at Caesar's villa, Posca reads Caesar's will, containing his adoption of Gaius Octavian as own son, as well as Posca's freedom. Later, as Anthony leaves Rome to take over Mutina, Posca accompanies him, becoming his political advisor.
- A literal Latin translation for a male body slave would be Servus Corporis.
- A normal Latin term for a body slave was an Ammanuensis, which is translated as "within hand's reach".