Gnaeus Fabius Gracilis was a wealthy Roman citizen. He was the husband of Marcia and the father of Optatus. He commissioned a statue of his son to be made for his sixteenth birthday, and hired Ursus to sculpt it.
When the Tenth Doctor and Rose Tyler arrived in ancient Rome in 120, they stopped three men who were mugging him. He told them about his missing son and purchased Vanessa from Balbus. Taking everyone to his villa, he let them search for his son.
He travelled with the Doctor to Rome and picked up the vial of green liquid the Doctor dropped as he was arrested. He later helped restore those who were turned to stone by Ursus as well as restore his son. He kept the information of Optatus' return from his wife, as he was afraid it would disturb her mind. (PROSE: The Stone Rose)